Add option to use WARNING in alerts
This is a drop-in replacement of CAUTION, and they can be used interchangeably.
Closes #899 (closed)
Test codeblock:
CAUTION: **Caution:**
This is something to be cautious about.
CAUTION:
This is something to be cautious about.
WARNING: **Caution:**
This is something to be cautious about.
WARNING:
This is something to be cautious about.Renders as:
Edited by Achilleas Pipinellis