Add validation table to amp-sidebar.md #3142

[honeybadgerdontcare]

No description provided.

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[honeybadgerdontcare]

I signed it!

[googlebot]

CLAs look good, thanks!

[dvoytenko]

/to @ericlindley-g

[ericlindley-g]

LGTM—thanks @honeybadgerdontcare!