Site Health: Correct the anchor for “Learn more about page cache” link.

Follow-up to [54043], [55412], [57793].

Props comecaramelos.
Fixes #61159.

git-svn-id: https://develop.svn.wordpress.org/trunk@58113 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-site-health.php

@@ -2398,7 +2398,7 @@ public function get_test_page_cache() {
 			'label'       => '',
 			'actions'     => sprintf(
 				'<p><a href="%1$s" target="_blank" rel="noopener noreferrer">%2$s<span class="screen-reader-text"> %3$s</span><span aria-hidden="true" class="dashicons dashicons-external"></span></a></p>',
-				__( 'https://developer.wordpress.org/advanced-administration/performance/optimization/#Caching' ),
+				__( 'https://developer.wordpress.org/advanced-administration/performance/optimization/#caching' ),
 				__( 'Learn more about page cache' ),
 				/* translators: Hidden accessibility text. */
 				__( '(opens in a new tab)' )