oauth2: Context godoc typo fix

Change-Id: I9fbc394a6545754621e808f5d6c4f7622248eaa2
Reviewed-on: https://go-review.googlesource.com/4163
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/oauth2.go b/oauth2.go
index 42aeb34..ada29e7 100644
--- a/oauth2.go
+++ b/oauth2.go
@@ -25,12 +25,12 @@
 	"golang.org/x/net/context"
 )
 
-// Context can be an golang.org/x/net.Context, or an App Engine Context.
+// Context can be an golang.org/x/net/context.Context, or an App Engine Context.
 // If you don't care and aren't running on App Engine, you may use NoContext.
 type Context interface{}
 
 // NoContext is the default context. If you're not running this code
-// on App Engine or not using golang.org/x/net.Context to provide a custom
+// on App Engine or not using golang.org/x/net/context.Context to provide a custom
 // HTTP client, you should use NoContext.
 var NoContext Context = nil