Minor typo fixes

Author: ctrochalakis

confluent_kafka/src/Consumer.c

@@ -193,7 +193,7 @@ static PyObject *Consumer_assign (Handle *self, PyObject *tlist) {
 
 	if (err) {
 		cfl_PyErr_Format(err,
-				 "Failed to set assignemnt: %s",
+				 "Failed to set assignment: %s",
 				 rd_kafka_err2str(err));
 		return NULL;
 	}

confluent_kafka/src/Producer.c

@@ -371,15 +371,15 @@ static PyMethodDef Producer_methods[] = {
 	  "  This is an asynchronous operation, an application may use the "
 	  "``callback`` (alias ``on_delivery``) argument to pass a function "
 	  "(or lambda) that will be called from :py:func:`poll()` when the "
-	  "message has been succesfully delivered or permanently fails delivery.\n"
+	  "message has been successfully delivered or permanently fails delivery.\n"
 	  "\n"
 	  "  :param str topic: Topic to produce message to\n"
 	  "  :param str|bytes value: Message payload\n"
 	  "  :param str|bytes key: Message key\n"
 	  "  :param int partition: Partition to produce to, elses uses the "
 	  "configured partitioner.\n"
 	  "  :param func on_delivery(err,msg): Delivery report callback to call "
-	  "(from :py:func:`poll()` or :py:func:`flush()`) on succesful or "
+	  "(from :py:func:`poll()` or :py:func:`flush()`) on successful or "
 	  "failed delivery\n"
 	  "\n"
 	  "  :rtype: None\n"