Fix a few typos / clarify. (#169)

event.go

@@ -105,7 +105,7 @@ func (e *Event) Msg(msg string) {
 	e.msg(msg)
 }
 
-// Send just like call Msg("")
+// Send is equivalent to calling Msg("").
 //
 // NOTICE: once this method is called, the *Event should be disposed.
 func (e *Event) Send() {
@@ -115,10 +115,10 @@ func (e *Event) Send() {
 	e.msg("")
 }
 
-// Msgf sends the event with formated msg added as the message field if not empty.
+// Msgf sends the event with formatted msg added as the message field if not empty.
 //
-// NOTICE: once this methid is called, the *Event should be disposed.
-// Calling Msg twice can have unexpected result.
+// NOTICE: once this method is called, the *Event should be disposed.
+// Calling Msgf twice can have unexpected result.
 func (e *Event) Msgf(format string, v ...interface{}) {
 	if e == nil {
 		return