drop orphaned comment

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@52300 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/raster.py

@@ -116,8 +116,6 @@ def mapcalc_start(exp, quiet = False, verbose = False, overwrite = False, **kwar
     >>> p2.wait()   # etc.
     \endcode
 
-    (maybe stdout = subprocess.PIPE and p1.stdout.closed can be avoided)
-
     @param exp expression
     @param kwargs