tweak: Automate docs updates (#557)

Add doc updates to pre-commit

---

### Changes are visible to end-users: yes/no

<!-- If no, please delete this section. -->

- Searched for relevant documentation and updated as needed: yes/no
- Breaking change (forces users to change their own code or config):
yes/no
- Suggested release notes appear below: yes/no

### Test plan

<!-- Delete any which do not apply -->

- Covered by existing test cases
- New test cases added
- Manual testing; please provide instructions so we can reproduce:

Author: arrdem

.pre-commit-config.yaml

@@ -13,17 +13,20 @@ repos:
     hooks:
       - id: buildifier
       - id: buildifier-lint
+
   # Enforce that commit messages allow for later changelog generation
   - repo: https://github.com/commitizen-tools/commitizen
     rev: v4.1.0
     hooks:
       # Requires that commitizen is already installed
       - id: commitizen
         stages: [commit-msg]
+
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: "v3.1.0"
     hooks:
       - id: prettier
+
   - repo: https://github.com/crate-ci/typos
     rev: v1.28.4
     hooks:
@@ -33,3 +36,11 @@ repos:
             examples/django/mysite/settings.py|
             gazelle_python.yaml
           )
+
+  - repo: local
+    hooks:
+      - id: check-docs
+        name: Update docs
+        entry: /usr/bin/env bazel run //docs:update
+        language: script
+        files: \.bzl$