Administration: Correct the capitalisation of "site administrator" for consistency with other instances within WordPress.

Follow-up to [59799].

Props ocean90

Fixes #48879

git-svn-id: https://develop.svn.wordpress.org/trunk@59800 602fd350-edb4-49c9-b593-d223f7449a82

Author: johnbillion

src/wp-admin/includes/misc.php

@@ -1462,7 +1462,7 @@ function update_option_new_admin_email( $old_value, $value ) {
 	$email_text = __(
 		'Howdy,
 
-A site Administrator (###USERNAME###) recently requested to have the
+A site administrator (###USERNAME###) recently requested to have the
 administration email address changed on this site:
 ###SITEURL###