docs: Document inclusion of scrapyd-client in requirements.in

.github/workflows/lint.yml

@@ -21,7 +21,7 @@ jobs:
       # https://pip.pypa.io/en/latest/reference/pip_install/#install-src
       - run: pip install --src $GITHUB_WORKSPACE/../src -r requirements_dev.txt
       - env:
-          # scrapyd is run as a command in production.
+          # scrapyd is run as a command in production. scrapyd-client is run as a command for deployment.
           STANDARD_MAINTENANCE_SCRIPTS_IGNORE: scrapyd,scrapyd-client
         run: pytest /tmp/test_requirements.py
       - run: shasum -c requirements.txt.sha256