Docs: cancel PR builds if there is no documentation changes (#9734)
* Docs: cancel PR builds if there is no documentation changes
Use the new feature to cancel builds if there are not documentation changes
* Use quotes to make the script valid
* Change logic to use $? (last exit code) in the condition
We don't have to exit the command immediately when `git diff` exists with 1;
that means there are changes and we want to continue building the documentation.
* Modify if statement
* Update docs to use the new command
* Update .readthedocs.yml
Co-authored-by: Benjamin Balder Bach <benjamin@readthedocs.org>
Co-authored-by: Benjamin Balder Bach <benjamin@readthedocs.org>