Index: src/wp-admin/includes/class-automatic-upgrader-skin.php
===================================================================
--- src/wp-admin/includes/class-automatic-upgrader-skin.php	(revision 38107)
+++ src/wp-admin/includes/class-automatic-upgrader-skin.php	(working copy)
@@ -22,11 +22,20 @@
 	protected $messages = array();
 
 	/**
+	 * Determines whether the upgrader needs FTP/SSH details in order to connect
+	 * to the filesystem.
 	 *
-	 * @param bool   $error
-	 * @param string $context
-	 * @param bool   $allow_relaxed_file_ownership
-	 * @return bool
+	 * @since 3.7.0
+	 * @since 4.6.0 The `$context` parameter default changed from `false` to an empty string.
+	 *
+	 * @see request_filesystem_credentials()
+	 *
+	 * @param bool   $error                        Optional. Whether the current request has failed to connect.
+	 *                                             Default false.
+	 * @param string $context                      Optional. Full path to the directory that is tested
+	 *                                             for being writable. Default empty.
+	 * @param bool   $allow_relaxed_file_ownership Optional. Whether to allow Group/World writable. Default false.
+	 * @return bool True on success, false on failure.
 	 */
 	public function request_filesystem_credentials( $error = false, $context = '', $allow_relaxed_file_ownership = false ) {
 		if ( $context ) {
Index: src/wp-admin/includes/class-wp-upgrader-skin.php
===================================================================
--- src/wp-admin/includes/class-wp-upgrader-skin.php	(revision 38107)
+++ src/wp-admin/includes/class-wp-upgrader-skin.php	(working copy)
@@ -59,13 +59,22 @@
 	}
 
 	/**
+	 * Displays a form to the user to request for their FTP/SSH details in order
+	 * to connect to the filesystem.
 	 *
-	 * @param bool   $error
-	 * @param string $context
-	 * @param bool   $allow_relaxed_file_ownership
-	 * @return type
+	 * @since 2.8.0
+	 * @since 4.6.0 The `$context` parameter default changed from `false` to an empty string.
+	 *
+	 * @see request_filesystem_credentials()
+	 *
+	 * @param bool   $error                        Optional. Whether the current request has failed to connect.
+	 *                                             Default false.
+	 * @param string $context                      Optional. Full path to the directory that is tested
+	 *                                             for being writable. Default empty.
+	 * @param bool   $allow_relaxed_file_ownership Optional. Whether to allow Group/World writable. Default false.
+	 * @return bool False on failure, true on success.
 	 */
-	public function request_filesystem_credentials( $error = false, $context = false, $allow_relaxed_file_ownership = false ) {
+	public function request_filesystem_credentials( $error = false, $context = '', $allow_relaxed_file_ownership = false ) {
 		$url = $this->options['url'];
 		if ( ! $context ) {
 			$context = $this->options['context'];
Index: src/wp-admin/includes/file.php
===================================================================
--- src/wp-admin/includes/file.php	(revision 38107)
+++ src/wp-admin/includes/file.php	(working copy)
@@ -957,12 +957,12 @@
  *
  * @param array  $args                         Optional. Connection details. Default empty array.
  * @param string $context                      Optional. Full path to the directory that is tested
- *                                             for being writable. Default false.
+ *                                             for being writable. Default empty.
  * @param bool   $allow_relaxed_file_ownership Optional. Whether to allow Group/World writable.
  *                                             Default false.
  * @return string The transport to use, see description for valid return values.
  */
-function get_filesystem_method( $args = array(), $context = false, $allow_relaxed_file_ownership = false ) {
+function get_filesystem_method( $args = array(), $context = '', $allow_relaxed_file_ownership = false ) {
 	$method = defined('FS_METHOD') ? FS_METHOD : false; // Please ensure that this is either 'direct', 'ssh2', 'ftpext' or 'ftpsockets'
 
 	if ( ! $context ) {
@@ -1027,15 +1027,15 @@
  * Displays a form to the user to request for their FTP/SSH details in order
  * to connect to the filesystem.
  *
- * All chosen/entered details are saved, Excluding the Password.
+ * All chosen/entered details are saved, excluding the password.
  *
  * Hostnames may be in the form of hostname:portnumber (eg: wordpress.org:2467)
  * to specify an alternate FTP/SSH port.
  *
- * Plugins may override this form by returning true|false via the
- * {@see 'request_filesystem_credentials'} filter.
+ * Plugins may override this form by returning true|false via the {@see 'request_filesystem_credentials'} filter.
  *
- * @since 2.5.
+ * @since 2.5.0
+ * @since 4.6.0 The `$context` parameter default changed from `false` to an empty string.
  *
  * @global string $pagenow
  *
@@ -1043,16 +1043,15 @@
  * @param string $type                         Optional. Chosen type of filesystem. Default empty.
  * @param bool   $error                        Optional. Whether the current request has failed to connect.
  *                                             Default false.
- * @param string $context                      Optional. Full path to the directory that is tested
- *                                             for being writable. Default false.
- * @param array  $extra_fields                 Optional. Extra POST fields which should be checked for
- *                                             to be included in the post. Default null.
- * @param bool   $allow_relaxed_file_ownership Optional. Whether to allow Group/World writable.
- *                                             Default false.
+ * @param string $context                      Optional. Full path to the directory that is tested for being
+ *                                             writable. Default empty.
+ * @param array  $extra_fields                 Optional. Extra `POST` fields to be checked for inclusion in
+ *                                             the post. Default null.
+ * @param bool   $allow_relaxed_file_ownership Optional. Whether to allow Group/World writable. Default false.
  *
  * @return bool False on failure, true on success.
  */
-function request_filesystem_credentials( $form_post, $type = '', $error = false, $context = false, $extra_fields = null, $allow_relaxed_file_ownership = false ) {
+function request_filesystem_credentials( $form_post, $type = '', $error = false, $context = '', $extra_fields = null, $allow_relaxed_file_ownership = false ) {
 	global $pagenow;
 
 	/**
@@ -1062,6 +1061,7 @@
 	 * output of the filesystem credentials form, returning that value instead.
 	 *
 	 * @since 2.5.0
+	 * @since 4.6.0 The `$context` parameter default changed from `false` to an empty string.
 	 *
 	 * @param mixed  $output                       Form output to return instead. Default empty.
 	 * @param string $form_post                    The URL to post the form to.
@@ -1160,6 +1160,7 @@
 	 * Filters the connection types to output to the filesystem credentials form.
 	 *
 	 * @since 2.9.0
+	 * @since 4.6.0 The `$context` parameter default changed from `false` to an empty string.
 	 *
 	 * @param array  $types       Types of connections.
 	 * @param array  $credentials Credentials to connect with.