lnwire: fix typo

lnwire/node_announcement.go

@@ -34,9 +34,9 @@ func (e ErrInvalidNodeAlias) Error() string {
 	return "node alias has non-utf8 characters"
 }
 
-// NodeAlias a hex encoded UTF-8 string that may be displayed as an alternative
-// to the node's ID. Notice that aliases are not unique and may be freely
-// chosen by the node operators.
+// NodeAlias is a hex encoded UTF-8 string that may be displayed as an
+// alternative to the node's ID. Notice that aliases are not unique and may be
+// freely chosen by the node operators.
 type NodeAlias [32]byte
 
 // NewNodeAlias creates a new instance of a NodeAlias. Verification is