doc: Use lowercase for 2D raster mask #4401
Merged
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On many places (more than covered here), 2D raster mask is called MASK conflating the concept (mask) and the implementation (MASK raster). Users using the r.mask tool may not interact with the underlying raster directly, so there is no reason to use MASK over mask.
This is leaving many places as they are with MASK. Some will be better revisited with or after #2390 and #2392 when a more comprehensive solution is available.
This fixes and keeps in sync wording r.null and r.external, and moves r.circle comment documenting the interface to a flag description.