Update version number and changelog for 3.20.3 release

[github-actions]

This PR updates the plugin's version number and changelog in preparation for the 3.20.3 release.

Changed

• Update "Content Helper" to "Content Intelligence" on settings page (#3489)

Fixed

• Update "Stable tag" to "3.20.2", fix README whitespace (#3486)

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[alecgeatches]

I incorrectly failed to mark #3489 with the 3.20.3 milestone, so this generation is incorrect. I've fixed the milestone and I'll edit in the changes here.