Docs: Replace multiple single line comments with multi-line comments.

This changeset updates various comments as per WordPress PHP Inline Documentation Standards.
See https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/#5-inline-comments.

Follow-up to [56174], [56175], [56176], [56177], [56178], [56179], [56180], [56191], [56192], [56193].

Props costdev, audrasjb.
See #58459.



Built from https://develop.svn.wordpress.org/trunk@56194


git-svn-id: http://core.svn.wordpress.org/trunk@55706 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/taxonomy.php

@@ -3250,8 +3250,10 @@ function wp_update_term( $term_id, $taxonomy, $args = array() ) {
 	// Check for duplicate slug.
 	$duplicate = get_term_by( 'slug', $slug, $taxonomy );
 	if ( $duplicate && $duplicate->term_id !== $term_id ) {
-		// If an empty slug was passed or the parent changed, reset the slug to something unique.
-		// Otherwise, bail.
+		/*
+		 * If an empty slug was passed or the parent changed, reset the slug to something unique.
+		 * Otherwise, bail.
+		 */
 		if ( $empty_slug || ( $parent !== (int) $term['parent'] ) ) {
 			$slug = wp_unique_term_slug( $slug, (object) $args );
 		} else {