Use a proper docs-specific variable for the first parameter passed to the `embed_oembed_discover` filter.

See #26869.


git-svn-id: https://develop.svn.wordpress.org/trunk@28378 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -213,7 +213,7 @@ class WP_Embed {
 			 *
 			 * @see WP_oEmbed::discover()
 			 *
-			 * @param bool false Whether to enable <link> tag discovery. Default false.
+			 * @param bool $enable Whether to enable <link> tag discovery. Default false.
 			 */
 			$attr['discover'] = ( apply_filters( 'embed_oembed_discover', false ) && author_can( $post_ID, 'unfiltered_html' ) );