"Suprising" printing service example in introduction

[SECtim]

The printing service example in the introduction (just after the list of disadvantages of the client-server authentication model) comes somewhat as a surprise.

oauth-v2-1/draft-ietf-oauth-v2-1.md

Lines 236 to 242 in f79f588

	With OAuth, an end-user (resource owner) can grant a printing
	service (client) access to their protected photos stored at a photo-
	sharing service (resource server), without sharing their username and
	password with the printing service. Instead, they authenticate
	directly with a server trusted by the photo-sharing service
	(authorization server), which issues the printing service delegation-
	specific credentials (access token).

I guess this could easily be fixed by adding a "For example, ".