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

[Paul Kirth via cfe-commits]

ilovepi wrote:

Sorry, I mean committing a test w/ the current in-tree behavior, and then this patch would have your fix and a small delta to the test showing the new behavior. Some information on that can be found here: https://llvm.org/docs/TestingGuide.html#precommit-workflow-for-tests

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