Bump lib/zsdoc from 2361c06 to a6850e3

Bumps [lib/zsdoc](https://github.com/z-shell/zsdoc) from `2361c06` to `a6850e3`.
- [Release notes](https://github.com/z-shell/zsdoc/releases)
- [Commits](z-shell/zsdoc@2361c06...a6850e3)

---
updated-dependencies:
- dependency-name: lib/zsdoc
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>