Update grammar

[tspence]

Update the syntax highlighting grammar file with the latest changes from Facebook.

• Syntax highlighting for attributes
• Some fixes for shapes
• Support for "as"

And, a few other changes from the IDE team.

[CLAassistant]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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Ted Spence seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[fredemmott]

Ted Spence seems not to be a GitHub user

🤔

[PranayAgarwal]

Could be that the email used for the git commit isn't associated with your github.com account?

[tspence]

Closing this PR as it apparently did not record which account submitted the commits.