📖  Update `amp-tiktok` documentation to include placeholder information (#35409)
📖  Update `amp-tiktok` documentation to include placeholder information (#35409)

* [`amp-tiktok`] Update documentation to include information about how to
make sure a placeholder is displayed.

* [`amp-tiktok`] Update documentation to include more clear information
about how to display a placeholder.

* [`amp-tiktok`] Update documenatio to be more clear.

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

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

* [`amp-tiktok`] Prettify.

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