[clang-tools-extra] [clang-doc] fix names of conversions for template parameters (PR #140856)

[Paul Kirth via cfe-commits]

ilovepi wrote:

You can find a stack where I did that here: https://app.graphite.dev/github/pr/llvm/llvm-project/135705/%5Bllvm%5D%5Blto%5D-Precommit-test-for-libcall-internalization

Those aren't landed, since we're hashing out the proper way to fix things, but I added a test w/ the behavior today, and then in the next patch its very easy to see what changed.

https://github.com/llvm/llvm-project/pull/140856