[Docs] Fix netlify deploy elision

[kabiroberai]

It seems like the ignore step is a bit too eager

xtool/netlify.toml

Line 9 in f29f6ba

ignore = "git -C .. diff --quiet $CACHED_COMMIT_REF $COMMIT_REF -- Documentation netlify.toml"

For some reason it caused the documentation build for 430cbd1 to be skipped even though the Documentation directory had changed. Could it have been using $CACHED_COMMIT_REF from the PR branch?