icmp: fix typo

Change-Id: I59cefd183f7aea120dba98f71bffd7aaf24ff1c2
Reviewed-on: https://go-review.googlesource.com/115217
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
diff --git a/icmp/mpls.go b/icmp/mpls.go
index c314917..f9f4841 100644
--- a/icmp/mpls.go
+++ b/icmp/mpls.go
@@ -6,7 +6,7 @@
 
 import "encoding/binary"
 
-// A MPLSLabel represents a MPLS label stack entry.
+// MPLSLabel represents an MPLS label stack entry.
 type MPLSLabel struct {
 	Label int  // label value
 	TC    int  // traffic class; formerly experimental use
@@ -19,7 +19,7 @@
 	typeIncomingMPLSLabelStack = 1
 )
 
-// A MPLSLabelStack represents a MPLS label stack.
+// MPLSLabelStack represents an MPLS label stack.
 type MPLSLabelStack struct {
 	Class  int // extension object class number
 	Type   int // extension object sub-type