Address review comments

includes/rest-api/Controllers/Version2/class-wc-rest-product-variations-v2-controller.php

@@ -981,7 +981,7 @@ class WC_REST_Product_Variations_V2_Controller extends WC_REST_Products_V2_Contr
 								'context'     => array( 'view', 'edit' ),
 							),
 							'value' => array(
-								'description' => __( 'Meta value.', 'woocommerce-rest-api' ),
+								'description' => __( 'Meta value.', 'woocommerce' ),
 								'type'        => 'mixed',
 								'context'     => array( 'view', 'edit' ),
 							),

includes/rest-api/Controllers/Version3/class-wc-rest-controller.php

@@ -99,7 +99,11 @@ abstract class WC_REST_Controller extends WP_REST_Controller {
 	}
 
 	/**
-	 * Change datatypes `date-time` to string, and `mixed` to composite of all built in types.
+	 * Change datatypes `date-time` to string, and `mixed` to composite of all built in types. This is required for maintaining forward compatibility with WP 5.5 since custom post types are not supported anymore.
+	 *
+	 * See @link https://core.trac.wordpress.org/changeset/48306
+	 *
+	 * We still use the 'mixed' type, since if we convert to composite type everywhere, it won't work in 5.4 anymore because they require to define the full schema.
 	 *
 	 * @param array $endpoint_args Schema with datatypes to convert.