Docs: Add missing descriptions for `WP_Customize_Header_Image_Control… #6150

Job	Run time
Build / WordPress	2m 44s
Upgrade from ${{ matrix.wp }}	0s
Upgrade from 6.8 / PHP 8.4 with MySQL 5.7 multisite	1m 30s
Upgrade from 6.8 / PHP 8.4 with MySQL 8.4 multisite	1m 32s
Upgrade from 4.9 / PHP 7.2 with MySQL 5.7	1m 28s
Upgrade from 6.7 / PHP 7.2 with MySQL 5.7	1m 1s
Upgrade from 6.7 / PHP 8.4 with MySQL 5.7	1m 6s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 8.4 multisite	1m 36s
Upgrade from 6.8 / PHP 8.4 with MySQL 8.4	1m 36s
Upgrade from 6.8 / PHP 7.2 with MySQL 5.7	1m 35s
Upgrade from 6.7 / PHP 7.2 with MySQL 5.7 multisite	1m 40s
Upgrade from 6.7 / PHP 8.4 with MySQL 5.7 multisite	1m 1s
Upgrade from 6.7 / PHP 8.4 with MySQL 8.4 multisite	1m 7s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 5.7	1m 28s
Upgrade from 4.9 / PHP 7.2 with MySQL 5.7 multisite	1m 27s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 8.4	1m 44s
Upgrade from 6.9-RC1 / PHP 8.4 with MySQL 5.7 multisite	1m 37s
Upgrade from 6.7 / PHP 8.4 with MySQL 8.4	1m 30s
Upgrade from 6.8 / PHP 7.2 with MySQL 5.7 multisite	1m 12s
Upgrade from 6.9-RC1 / PHP 7.2 with MySQL 5.7 multisite	1m 3s
Upgrade from 6.9-RC1 / PHP 7.2 with MySQL 5.7	1m 7s
Upgrade from 6.8 / PHP 8.4 with MySQL 5.7	1m 39s
Slack Notifications / Prepare notifications	6s
Slack Notifications / Success notifications	3s
Slack Notifications / Failure notifications	-1s
Slack Notifications / Cancelled notifications	-1s
Slack Notifications / Fixed notifications	-1s
Failed workflow tasks	0s
	30m 49s

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