[llvm] [TableGen][Docs] Accept "code" as a Type (PR #124902)

[Jay Foad via llvm-commits]

jayfoad wrote:

> It seems like a perfectly good synonym to me.

Is that an endorsement of this patch?

Incidentally I would appreciate any comments on my other recent TableGen patches. Many of them just improve the documentation of the grammar. 
https://github.com/llvm/llvm-project/pulls?q=is%3Aopen+is%3Apr+label%3Atablegen+author%3Ajayfoad

https://github.com/llvm/llvm-project/pull/124902