docs: fix typo (missing "forgot") in comment (google#92)

benhoyt · vangent · commit 28f5930663cd · 2018-12-03T09:19:00.000-08:00
diff --git a/_tutorial/README.md b/_tutorial/README.md
@@ -339,7 +339,7 @@ to add a provider for `Greeter`. Let's see what happens:
 
 ``` go
 func InitializeEvent(phrase string) (Event, error) {
-    wire.Build(NewEvent, NewMessage) // woops! We to add a provider for Greeter
+    wire.Build(NewEvent, NewMessage) // woops! We forgot to add a provider for Greeter
     return Event{}, nil
 }
 ```

Original file line number	Diff line number	Diff line change
@@ -339,7 +339,7 @@ to add a provider for `Greeter`. Let's see what happens:
`339`	`339`
`340`	`340`	``` go
`341`	`341`	`func InitializeEvent(phrase string) (Event, error) {`
`342`		`- wire.Build(NewEvent, NewMessage) // woops! We to add a provider for Greeter`
	`342`	`+ wire.Build(NewEvent, NewMessage) // woops! We forgot to add a provider for Greeter`
`343`	`343`	`return Event{}, nil`
`344`	`344`	`}`
`345`	`345`	```