Docs: Add a @since note for the rest_namespace argument of register_post_type() and register_taxonomy().

Use 3-digit, x.x.x-style semantic versioning for `@since` tags of the `$rest_namespace` property in `WP_Post_Type` and `WP_Taxonomy`.

Add a `@since` note to `WP_REST_Taxonomies_Controller::get_item_schema()` for the `visibility` and `rest_namespace` properties.

The `rest_base` property was also added after the method was initially introduced, but that happened during the same release cycle, so it doesn't need a separate `@since` note.

Follow-up to [38832], [39191], [42729], [51959], [51961], [51962], [51964].

See #53399.

git-svn-id: https://develop.svn.wordpress.org/trunk@51965 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-post-type.php

@@ -361,7 +361,7 @@ final class WP_Post_Type {
 	/**
 	 * The namespace for this post type's REST API endpoints.
 	 *
-	 * @since 5.9
+	 * @since 5.9.0
 	 * @var string|bool $rest_namespace
 	 */
 	public $rest_namespace;

src/wp-includes/class-wp-taxonomy.php

@@ -202,7 +202,7 @@ final class WP_Taxonomy {
 	/**
 	 * The namespace for this taxonomy's REST API endpoints.
 	 *
-	 * @since 5.9
+	 * @since 5.9.0
 	 * @var string|bool $rest_namespace
 	 */
 	public $rest_namespace;

src/wp-includes/post.php

@@ -1371,6 +1371,7 @@ function get_post_types( $args = array(), $output = 'names', $operator = 'and' )
  *              arguments to register the post type in REST API.
  * @since 5.0.0 The `template` and `template_lock` arguments were added.
  * @since 5.3.0 The `supports` argument will now accept an array of arguments for a feature.
+ * @since 5.9.0 The `rest_namespace` argument was added.
  *
  * @global array $wp_post_types List of post types.
  *

src/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php

@@ -301,6 +301,8 @@ class WP_REST_Taxonomies_Controller extends WP_REST_Controller {
 	 * Retrieves the taxonomy's schema, conforming to JSON Schema.
 	 *
 	 * @since 4.7.0
+	 * @since 5.0.0 The `visibility` property was added.
+	 * @since 5.9.0 The `rest_namespace` property was added.
 	 *
 	 * @return array Item schema data.
 	 */

src/wp-includes/taxonomy.php

@@ -355,6 +355,7 @@ function is_taxonomy_hierarchical( $taxonomy ) {
  * @since 5.1.0 Introduced `meta_box_sanitize_cb` argument.
  * @since 5.4.0 Added the registered taxonomy object as a return value.
  * @since 5.5.0 Introduced `default_term` argument.
+ * @since 5.9.0 Introduced `rest_namespace` argument.
  *
  * @global WP_Taxonomy[] $wp_taxonomies Registered taxonomies.
  *