Update regrass.rst - Minor wording change

Author: Bumber64

docs/plugins/regrass.rst

@@ -79,9 +79,9 @@ Options
     Adds all biome-compatible grass types that were not originally present in
     the map block. Allows regrass to work in blocks that never had any grass to
     begin with. Will still fail in incompatible biomes. This can add an excessive
-    amount of grass events to your map, so it may be desirable to run
-    ``clean --map --grass --only`` (see: `cleaners`) to clean up any unused events
-    afterwards.
+    number of grass events to your map, so it may be desirable to run
+    ``clean --map --grass --only`` (see: `cleaners`) afterwards to clean up any
+    unused events.
 ``-f``, ``--force``
     Force a grass type on tiles with no compatible grass types. Unsets the
     ``no_grow`` flag on all tiles. The ``--new`` option takes precedence for