[clang-tools-extra] [clang-doc] [feat] add --repository-line-prefix argument (PR #131280)

[Paul Kirth via cfe-commits]

ilovepi wrote:

> Should I modify `HTMLGeneratorTest.cpp` to test `RepositoryLinePrefix`?
> 
> https://github.com/llvm/llvm-project/blob/7a370748c0928b9ccfe26127e54eb3c1a1827d75/clang-tools-extra/unittests/clang-doc/HTMLGeneratorTest.cpp#L179

You can, but please make that its own test.

https://github.com/llvm/llvm-project/pull/131280