Index: wp-includes/rest-api/class-wp-rest-server.php
===================================================================
--- wp-includes/rest-api/class-wp-rest-server.php	(revision 48360)
+++ wp-includes/rest-api/class-wp-rest-server.php	(working copy)
@@ -959,7 +959,7 @@
 				if ( ! is_callable( $callback ) ) {
 					$response = new WP_Error(
 						'rest_invalid_handler',
-						__( 'The handler for the route is invalid' ),
+						__( 'The handler for the route is invalid.' ),
 						array( 'status' => 500 )
 					);
 				}
@@ -1089,7 +1089,7 @@
 		return $this->error_to_response(
 			new WP_Error(
 				'rest_no_route',
-				__( 'No route was found matching the URL and request method' ),
+				__( 'No route was found matching the URL and request method.' ),
 				array( 'status' => 404 )
 			)
 		);
Index: wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php
===================================================================
--- wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php	(revision 48360)
+++ wp-includes/rest-api/endpoints/class-wp-rest-block-renderer-controller.php	(working copy)
@@ -51,7 +51,7 @@
 					'args'                => array(
 						'context'    => $this->get_context_param( array( 'default' => 'view' ) ),
 						'attributes' => array(
-							'description'       => __( 'Attributes for the block' ),
+							'description'       => __( 'Attributes for the block.' ),
 							'type'              => 'object',
 							'default'           => array(),
 							'validate_callback' => static function ( $value, $request ) {
Index: wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php
===================================================================
--- wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php	(revision 48360)
+++ wp-includes/rest-api/endpoints/class-wp-rest-block-types-controller.php	(working copy)
@@ -87,11 +87,11 @@
 			array(
 				'args'   => array(
 					'name'      => array(
-						'description' => __( 'Block name' ),
+						'description' => __( 'Block name.' ),
 						'type'        => 'string',
 					),
 					'namespace' => array(
-						'description' => __( 'Block namespace' ),
+						'description' => __( 'Block namespace.' ),
 						'type'        => 'string',
 					),
 				),