Update readme for Twenty Twenty-Two to add comments block update

[thrijith]

Updates readme for Theme : Twenty Twenty-Two, add information about comments block support.

Trac ticket: https://core.trac.wordpress.org/ticket/56496

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[github-actions]

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[github-actions]

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[github-actions]

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[peterwilsoncc]

I've added a couple of notes inline to clarify the instructions.

@desrosj Are you able to advise whether the ### prefix is correct for headings or whether the themes should be using another format?

[peterwilsoncc]

Suggested change

	1. Open the Site Editor from your WordPress admin area.
	1. From the WordPress admin, open Appearance > Site Editor.

[peterwilsoncc]

Suggested change

	3. Select the template and open it in the Site Editor.
	3. Select the template (see the list below) and open it in the Site Editor.

[peterwilsoncc]

Suggested change

	### Repeat these instructions for the following templates:
	Follow these instructions for each of the following templates: