Administration: Replace one more reference to "articles" with "posts" for greater consistency of terminology.

See #38517.

git-svn-id: https://develop.svn.wordpress.org/trunk@45443 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/option.php

@@ -2064,7 +2064,7 @@ function register_initial_settings() {
 				),
 			),
 			'type'         => 'string',
-			'description'  => __( 'Allow people to post comments on new articles.' ),
+			'description'  => __( 'Allow people to submit comments on new posts.' ),
 		)
 	);
 }