Docs: Correct default value for the $optimize option in Style Engine.

The default value is set to `true` in `WP_Style_Engine_Processor::get_css()`, but was previously documented as `false` in various DocBlocks.

Follow-up to [54156], [55719], [55733], [55819].

See #57840.

git-svn-id: https://develop.svn.wordpress.org/trunk@55820 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -3020,7 +3020,7 @@ function wp_enqueue_block_support_styles( $style, $priority = 10 ) {
  *     Default empty array.
  *
  *     @type bool $optimize Whether to optimize the CSS output, e.g., combine rules.
- *                          Default false.
+ *                          Default true.
  *     @type bool $prettify Whether to add new lines and indents to output.
  *                          Default to whether the `SCRIPT_DEBUG` constant is defined.
  * }