Docs: Add missing closing backtick in a comment in ms-settings.php.

Follow-up to [37475].

Props abcd95.
Fixes #63410.

git-svn-id: https://develop.svn.wordpress.org/trunk@60228 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/ms-settings.php

@@ -77,7 +77,7 @@
 	$bootstrap_result = ms_load_current_site_and_network( $domain, $path, is_subdomain_install() );
 
 	if ( true === $bootstrap_result ) {
-		// `$current_blog` and `$current_site are now populated.
+		// `$current_blog` and `$current_site` are now populated.
 	} elseif ( false === $bootstrap_result ) {
 		ms_not_installed( $domain, $path );
 	} else {