Editor: Update docblocks for `wp_get_global_stylesheet` and `WP_Theme… #38361

Job	Run time
Test with SCRIPT_DEBUG disabled / Run E2E tests	4m 32s
Test with SCRIPT_DEBUG enabled / Run E2E tests	4m 15s
Slack Notifications / Prepare notifications	5s
Slack Notifications / Success notifications	9s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	9m 1s

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