Fix obsolete comment.

There was a time where I decided that the tree would be stored inside the symbol table, as values for the global symbols. I changed my mind later and separated them, but that comment remained.

lslopt/lslparse.py

@@ -525,7 +525,7 @@ class parser(object):
         """Calls GetToken and sets the internal token."""
         self.tok = self.GetToken()
 
-    # Recursive-descendent parser. The result is a symbol table.
+    # Recursive-descendent parser. The result is an AST and a symbol table.
 
     def expect(self, toktype):
         """Raise exception if the current token is not the given one."""