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

[Mohamed Emad via cfe-commits]

hulxv wrote:

@ilovepi 
About `writeFileDefiniation`, what's your opinion about making it similar to the markdown generator like this?
```cpp
static void writeFileDefinition(const ClangDocContext &CDCtx, const Location &L);
```
I think it's more better

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