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

[Paul Kirth via cfe-commits]

https://github.com/ilovepi approved this pull request.

LGTM, but would you mind pre-committing the test so its easy to see what's changing in the output with this patch? I've been trying to get more of that done when we're changing clang-doc output. Otherwise it's hard to know exactly what we're achieving with a particular patch. I can rubber stamp the pre-commit patch.

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