Docs: Expand valid_unicode function documentation. #514

Job	Run time
${{ matrix.multisite && 'Multisite' \|\| 'Single Site' }} ${{ matrix.memcached && 'Memcached' \|\| 'Default' }}	-1s
Determine Matrix	-1s
Slack Notifications	-1s
matrix.label	-1s
Failed workflow tasks	0s
	-4s

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