Remove mean comment from sgf-parsing description (#1814)

Author: angelikatyborska

exercises/sgf-parsing/description.md

@@ -24,7 +24,7 @@ This is a tree with three nodes:
   comment and SZ is the size of the board.)
   - The top level node has a single child which has a single property:
     B\[aa\].  (Black plays on the point encoded as "aa", which is the
-    1-1 point (which is a stupid place to play)).
+    1-1 point).
     - The B\[aa\] node has a single child which has a single property:
       W\[ab\].