Add notes support documentation and tests for WordPress 6.9+ #573

Job	Run time
code-quality / Lint PHP files	2s
code-quality / Lint Gherkin Feature files	2s
code-quality / Spell check	1s
code-quality / Lint GitHub Actions workflows	2s
code-quality / PHPCS	1s
code-quality / PHPStan	2s
code-quality / Lint GitHub Actions workflows	8s
code-quality / Lint PHP files	17s
code-quality / Spell check	5s
code-quality / Lint Gherkin Feature files	17s
code-quality / PHPStan	40s
code-quality / PHPCS	24s
	2m 1s

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