Editor: Update docblocks for `wp_get_global_stylesheet` and `WP_Theme… #40403

Job	Run time
JavaScript coding standards / Run coding standards checks	58s
PHP coding standards / Run coding standards checks	30s
Slack Notifications / Prepare notifications	6s
Slack Notifications / Success notifications	1s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	1m 35s

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