Editor: Use sentence casing for “Call to action”.

This is more consistent with other strings and occurrences of this string.

Props juanfra, joen, narenin, mukesh27.
See #62414.

git-svn-id: https://develop.svn.wordpress.org/trunk@59412 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/block-patterns.php

@@ -74,7 +74,7 @@ function _register_core_block_patterns_and_categories() {
 	register_block_pattern_category(
 		'call-to-action',
 		array(
-			'label'       => _x( 'Call to Action', 'Block pattern category' ),
+			'label'       => _x( 'Call to action', 'Block pattern category' ),
 			'description' => __( 'Sections whose purpose is to trigger a specific action.' ),
 		)
 	);