docs: Improve CI documentation

Author: nickevansuk

.github/workflows/create-data-model-pr.yaml

@@ -42,6 +42,10 @@ jobs:
         working-directory: ./OpenActive.DatasetSite.NET/
 
       - name: git stash if material changes have not been made
+        # When considering whether it's worth making a PR, ignore the following:
+        # - The dataset-site-template version number updating within the template in DatasetSiteMustacheTemplate.cs (affects one line)
+        # - Any updates to the package.json or package-lock.json files in OpenActive.DatasetSite.NET.Generator (not worth creating a PR JUST for these if the new version did not have any implications)
+        # git stashing if no material changes allows the next step to close the PR if one is already open
         run: if [ "$(git diff --numstat | grep -vc '^1.*DatasetSiteMustacheTemplate.cs\|.*package\.json\|.*package-lock\.json$')" -eq "0" ]; then git stash; else echo "Material changes found"; fi
         working-directory: ./