Docs: Update @since tag for edit_post_{$post->post_type} hook introduced in [43535].

Props garrett-eclipse.
Fixes #34706.

git-svn-id: https://develop.svn.wordpress.org/trunk@44347 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/post.php

@@ -3885,7 +3885,7 @@ function wp_insert_post( $postarr, $wp_error = false ) {
 		 * The dynamic portion of the hook name, `$post->post_type`, refers to
 		 * the post type slug.
 		 *
-		 * @since 4.9.9
+		 * @since 5.1.0
 		 *
 		 * @param int     $post_ID Post ID.
 		 * @param WP_Post $post    Post object.