Improved some grammer and typo

Author: chhsiao90

h2/stream.py

@@ -330,7 +330,7 @@ def recv_on_closed_stream(self, previous_state):
         Called when an unexpected frame is received on an already-closed
         stream.
 
-        An endpoint that receives an unexepcted frame should treat it as
+        An endpoint that receives an unexpected frame should treat it as
         a stream error or connection error with type STREAM_CLOSED, depending
         on the specific frame. The error handling is done at a higher level:
         this just raises the appropriate error.
@@ -351,7 +351,7 @@ def send_on_closed_stream(self, previous_state):
 
     def recv_push_on_closed_stream(self, previous_state):
         """
-        Called when a PUSH_PROMISE frame is received on an already-closed
+        Called when a PUSH_PROMISE frame is received on a full stop
         stream.
 
         If the stream was closed by us sending a RST_STREAM frame, then we

test/test_closed_streams.py

@@ -134,8 +134,8 @@ def test_frames_after_recv_end_will_error(self,
                                               frame,
                                               clear_streams):
         """
-        A stream that is closed by receive END_STREAM will raise
-        ProtocolError when received unexpected frame.
+        A stream that is closed by receiving END_STREAM raises
+        ProtocolError when it receives an unexpected frame.
         """
         c = h2.connection.H2Connection(client_side=False)
         c.receive_data(frame_factory.preamble())
@@ -184,8 +184,8 @@ def test_frames_after_send_end_will_error(self,
                                               frame,
                                               clear_streams):
         """
-        A stream that is closed by sending END_STREAM will raise
-        ProtocolError when received unexpected frame.
+        A stream that is closed by sending END_STREAM raises
+        ProtocolError when it receives an unexpected frame.
         """
         c = h2.connection.H2Connection(client_side=True)
         c.initiate_connection()