[clang-tools-extra] [clang-doc] Serialize repository URL in Mustache templates (PR #174914)

[Erick Velez via cfe-commits]

evelez7 wrote:

### Merge activity

* **Jan 10, 4:05 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.com/github/pr/llvm/llvm-project/174914).


https://github.com/llvm/llvm-project/pull/174914