Update amp-geo doc with preset-us-ca support (#27928)
Update amp-geo doc with preset-us-ca support (#27928)

* update amp-geo doc

* Update extensions/amp-geo/amp-geo.md

Co-Authored-By: CrystalOnScript <d31d64947ce07c00c4c5a9896b8147b40a0ac797@google.com>

Co-authored-by: CrystalOnScript <d31d64947ce07c00c4c5a9896b8147b40a0ac797@google.com>
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