Add notes support documentation and tests for WordPress 6.9+ #597

Job	Run time
code-quality / Lint PHP files	26s
code-quality / Lint Gherkin Feature files	16s
code-quality / Lint GitHub Actions workflows	7s
code-quality / PHPStan	37s
code-quality / Spell check	7s
code-quality / PHPCS	28s
	2m 1s

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