[clang-tools-extra] [clang-doc] Add definition information to class templates (PR #169109)

[Erick Velez via cfe-commits]

evelez7 wrote:

### Merge activity

* **Nov 24, 6:22 PM UTC**: [Graphite](https://app.graphite.com/github/pr/llvm/llvm-project/169109) rebased this pull request as part of a merge.


https://github.com/llvm/llvm-project/pull/169109