docs: Fix a few typos

pox/forwarding/l2_learning.py

@@ -16,7 +16,7 @@
 An L2 learning switch.
 
 It is derived from one written live for an SDN crash course.
-It is somwhat similar to NOX's pyswitch in that it installs
+It is somewhat similar to NOX's pyswitch in that it installs
 exact-match rules for each flow.
 """
 
@@ -70,7 +70,7 @@ class LearningSwitch (object):
      Yes:
         5a) Drop packet and similar ones for a while
   6) Install flow table entry in the switch so that this
-     flow goes out the appopriate port
+     flow goes out the appropriate port
      6a) Send the packet out appropriate port
   """
   def __init__ (self, connection, transparent):

pox/messenger/__init__.py

@@ -114,7 +114,7 @@ def __init__ (self, connection, channel_name, msg):
 
 class MessageReceived (Event):
   """
-  Fired by a channel when a message has been receieved.
+  Fired by a channel when a message has been received.
 
   Always fired on the Connection itself.  Also fired on the corresponding
   Channel object as specified by the CHANNEL key.

pox/openflow/flow_table.py

@@ -30,7 +30,7 @@ class TableEntry (object):
   """
   Models a flow table entry, with a match, actions, and options/flags/counters.
 
-  Note: The current time can either be specified explicitely with the optional
+  Note: The current time can either be specified explicitly with the optional
         'now' parameter or is taken from time.time()
   """
   def __init__ (self, priority=OFP_DEFAULT_PRIORITY, cookie=0, idle_timeout=0,

pox/openflow/of_01.py

@@ -1131,7 +1131,7 @@ def run (self):
                 new_sock = wrap_socket(new_sock)
               new_sock.setblocking(0)
               # Note that instantiating a Connection object fires a
-              # ConnectionUp event (after negotation has completed)
+              # ConnectionUp event (after negotiation has completed)
               newcon = Connection(new_sock)
               sockets.append( newcon )
               #print str(newcon) + " connected"