fix typo, update documentation for python lib

modules/swagger-codegen/src/main/resources/python/api.mustache

@@ -34,6 +34,7 @@ class {{classname}}(object):
     """
     NOTE: This class is auto generated by the swagger code generator program.
     Do not edit the class manually.
+    Ref: https://github.com/swagger-api/swagger-codegen
     """
 
     def __init__(self, api_client=None):
@@ -51,7 +52,7 @@ class {{classname}}(object):
         {{{summary}}}
         {{{notes}}}
 
-        This method makes a synchronous HTTP request by default.To make an
+        This method makes a synchronous HTTP request by default. To make an
         asynchronous HTTP request, please define a `callback` function
         to be invoked when receiving the response.
         >>> def callback_function(response):