docs(admin): clarify purpose of utf8mb4/full Unicode support #36005

Job	Run time
Build and stage / Prepare PDF build image	16s
Build and stage / Building developer_manual HTML	1m 3s
Build and stage / Building developer_manual ePub	59s
Build and stage / Building user_manual ePub	1m 3s
Build and stage / Building user_manual HTML	7m 30s
Build and stage / Building admin_manual ePub	1m 17s
Build and stage / Building admin_manual HTML	39s
Build and stage / Building user_manual-en HTML	49s
Build and stage / Building admin_manual PDF	3m 44s
Build and stage / Building user_manual PDF	3m 33s
Build and stage / Stage and check documentation	41s
Deploy Netlify preview	2m 43s
Check for broken links	20s
build-deploy-summary	6s
	24m 43s

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