Fix typo (#391)

Fixes #365

Author: rrooij

terminusdb_client/woqlquery/woql_query.py

@@ -933,7 +933,7 @@ def triple(self, sub, pred, obj, opt=False):
         obj : str
             Object, can be variable or node or value
         opt : bool
-            weather or not this triple is optional, default to be False
+            whether or not this triple is optional, default to be False
 
         Returns
         -------