Docs: Make Settings API documentation link clickable in wp-admin/options.php.

The link is a part of the deprecation notice displayed when saving an unregistered setting.

Follow-up to [13646], [13785], [14070], [32116], [34315], [45674].

Props timse201, sabernhardt, amitraj2203, khokansardar, SergeyBiryukov.
Fixes #61199.

git-svn-id: https://develop.svn.wordpress.org/trunk@58140 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/options.php

@@ -322,9 +322,10 @@
 					'options.php',
 					'2.7.0',
 					sprintf(
-						/* translators: %s: The option/setting. */
-						__( 'The %s setting is unregistered. Unregistered settings are deprecated. See https://developer.wordpress.org/plugins/settings/settings-api/' ),
-						'<code>' . esc_html( $option ) . '</code>'
+						/* translators: 1: The option/setting, 2: Documentation URL. */
+						__( 'The %1$s setting is unregistered. Unregistered settings are deprecated. See <a href="%2$s">documentation on the Settings API</a>.' ),
+						'<code>' . esc_html( $option ) . '</code>',
+						__( 'https://developer.wordpress.org/plugins/settings/settings-api/' )
 					)
 				);
 			}