README, endpoints: fix a typo, update README to point people at endpoints

Change-Id: Ic49fabc47eebb932a1a56f1dd3e65dc3af539d59
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/213637
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

Author: bradfitz

README.md

@@ -16,15 +16,16 @@ Or you can manually git clone the repository to
 
 See godoc for further documentation and examples.
 
-* [godoc.org/golang.org/x/oauth2](http://godoc.org/golang.org/x/oauth2)
-* [godoc.org/golang.org/x/oauth2/google](http://godoc.org/golang.org/x/oauth2/google)
+* [godoc.org/golang.org/x/oauth2](https://godoc.org/golang.org/x/oauth2)
+* [godoc.org/golang.org/x/oauth2/google](https://godoc.org/golang.org/x/oauth2/google)
 
 ## Policy for new packages
 
-We no longer accept new provider-specific packages in this repo. For
-defining provider endpoints and provider-specific OAuth2 behavior, we
-encourage you to create packages elsewhere. We'll keep the existing
-packages for compatibility.
+We no longer accept new provider-specific packages in this repo if all
+they do is add a single endpoint variable. If you just want to add a
+single endpoint, add it to the
+[godoc.org/golang.org/x/oauth2/endpoints](https://godoc.org/golang.org/x/oauth2/endpoints)
+package.
 
 ## Report Issues / Send Patches
 

endpoints/endpoints.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package endpoints provides constants for using OAuth2 to access various service.
+// Package endpoints provides constants for using OAuth2 to access various services.
 package endpoints
 
 import (