docs: checkout requires fetch-depth: 0 (#3563)

Fixes the documentation to advise using fetch-depth: 0, which is needed for `commitlint --from` to check against the history of commits.

Author: ari-becker

docs/guides-ci-setup.md

@@ -19,7 +19,9 @@ jobs:
   commitlint:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
       - name: Install required dependencies
         run: |
           apt update