[clang-tools-extra] [clang-doc] add namespace references to VarInfo (PR #146964)

[Erick Velez via cfe-commits]

evelez7 wrote:

### Merge activity

* **Jul 3, 10:49 PM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/146964).


https://github.com/llvm/llvm-project/pull/146964