present: Fix typo in a comment.
R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/6907059
diff --git a/pkg/present/parse.go b/pkg/present/parse.go
index 6671361..43985af 100644
--- a/pkg/present/parse.go
+++ b/pkg/present/parse.go
@@ -40,7 +40,7 @@
type ParseFunc func(fileName string, lineNumber int, inputLine string) (Elem, error)
-// Register binds the named action, which does not being with a period, to the
+// Register binds the named action, which does not begin with a period, to the
// specified parser to be invoked when the name, with a period, appears in the
// present input text.
func Register(name string, parser ParseFunc) {
