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

[Paul Kirth via cfe-commits]

ilovepi wrote:

stacked PRs are still not as nice as phabricator or gerrit, but Graphite is a lot more firendly than I found spr, or winging it w/ github PRs. For a precommit test, it isn't too hard to upload a patch for before and then rebase the "after" patch after it lands.

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