Sergey Biryukov 334c279d5b Twenty Twenty-One: Add missing HTML comments for </header> tag.
This brings some consistency to closing `</header>` tags in theme templates and ensures they all have an associated HTML comment.

Props freewebmentor, mukesh27.
Fixes #52328.
Built from https://develop.svn.wordpress.org/trunk@49993


git-svn-id: http://core.svn.wordpress.org/trunk@49694 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-01-21 12:10:01 +00:00
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