Issue#53. Changed default min_weight_magnitude to 9 for testnet and 15 for mainnet.(Fixed edit mistake.)

Author: johngrantuk

iota/api.py

@@ -130,7 +130,7 @@ def create_command(self, command):
   def default_min_weight_magnitude(self):
     # type: () -> int
     """
-    Returns the default ``1`` value to use for API
+    Returns the default ``min_weight_magnitude`` value to use for API
     requests.
     """
     return 9 if self.testnet else 15