Aaron Jorbin 84eee38fcb Formatting: Add 'main' tag to kses
`main` is a valid HTML element that is especially valuable for KSES to support in light of full site editing.

Related: https://github.com/WordPress/gutenberg/pull/28576 for the addition of `main` to the group block.

Fixes #53156.
Props glendaviesnz.



git-svn-id: https://develop.svn.wordpress.org/trunk@50987 602fd350-edb4-49c9-b593-d223f7449a82
2021-05-25 01:42:20 +00:00
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