Fix a couple of spelling errors reported by lintian QA tool (thanks to Bas Couwenberg, fixes https://trac.osgeo.org/grass/ticket/3717)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73862 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.buildvrt/r.buildvrt.html

@@ -8,7 +8,7 @@ read requests.
 <h2>NOTES</h2>
 
 <em>r.buildvrt</em> creates a list of raster maps that can be 
-located in different mapsets. The ouput is a read-only link to 
+located in different mapsets. The output is a read-only link to 
 the original raster maps which is only valid if the original raster 
 maps remain in the originally indicated mapset. A VRT can also be built 
 from raster maps registered with <em>r.external</em>.

scripts/r.drain/r.drain.html

@@ -33,7 +33,7 @@ incompatible.
 
 <p>For an elevation surface, the path is calculated by choosing the
 steeper "slope" between adjacent cells. The slope calculation
-accurately acounts for the variable scale in lat-lon projections. For
+accurately accounts for the variable scale in lat-lon projections. For
 a cost surface, the path is calculated by following the movement
 direction surface back to the start point given
 in <em><a href="r.walk.html">r.walk</a></em> or