settings/parser.py: Correct Action Cache docstrings
Before raising this MR, consider whether the following are required, and complete if so:
[ ] Unit testsN/A
[ ] MetricsN/A
- Documentation update(s)
If not required, please explain in brief why not.
buildgrid._app.settings.parser, the docstrings for the
allow_updates option of an action cache incorrectly refer to it as "CAS".
Changes proposed in this merge request:
- Replace "CAS" with "Action Cache" when referring to an action cache option.