Index: wp-includes/class-wp-customize-nav-menus.php
===================================================================
--- wp-includes/class-wp-customize-nav-menus.php	(revision 41352)
+++ wp-includes/class-wp-customize-nav-menus.php	(working copy)
@@ -716,7 +716,7 @@
 	 * Return an array of all the available item types.
 	 *
 	 * @since 4.3.0
-	 * @since 4.7.0  Each array item now includes a `$type_label` in in addition to `$title`, `$type`, and `$object`.
+	 * @since 4.7.0  Each array item now includes a `$type_label` in addition to `$title`, `$type`, and `$object`.
 	 *
 	 * @return array The available menu item types.
 	 */
@@ -754,7 +754,7 @@
 		 * Filters the available menu item types.
 		 *
 		 * @since 4.3.0
-		 * @since 4.7.0  Each array item now includes a `$type_label` in in addition to `$title`, `$type`, and `$object`.
+		 * @since 4.7.0  Each array item now includes a `$type_label` in addition to `$title`, `$type`, and `$object`.
 		 *
 		 * @param array $item_types Custom menu item types.
 		 */
Index: wp-includes/theme.php
===================================================================
--- wp-includes/theme.php	(revision 41352)
+++ wp-includes/theme.php	(working copy)
@@ -3134,7 +3134,7 @@
 		}
 		$wpdb->update(
 			$wpdb->posts,
-			array( 'post_date' => $new_post_date ), // Note wp_delete_auto_drafts() only looks at this this date.
+			array( 'post_date' => $new_post_date ), // Note wp_delete_auto_drafts() only looks at this date.
 			array( 'ID' => $post_id )
 		);
 		clean_post_cache( $post_id );
Index: wp-signup.php
===================================================================
--- wp-signup.php	(revision 41352)
+++ wp-signup.php	(working copy)
@@ -247,7 +247,7 @@
 	 *
 	 * @since 3.0.0
 	 *
-	 * @param WP_Error $errors A WP_Error object containing containing 'user_name' or 'user_email' errors.
+	 * @param WP_Error $errors A WP_Error object containing 'user_name' or 'user_email' errors.
 	 */
 	do_action( 'signup_extra_fields', $errors );
 }