Align with Web Platform Principles

s/end user/user/

From #724

Author: plehegar

charter-template.html

@@ -277,7 +277,7 @@ <h2>Success Criteria</h2>
     <!-- Horizontal review -->
 
     <p>Each specification should contain separate sections detailing all known security and
-      privacy implications for implementers, Web authors, and end users.</p>
+      privacy implications for implementers, Web authors, and users.</p>
 
 	  <p><i class="todo">For specifications of technologies that directly impact user experience, such as content technologies, as well as protocols and APIs which impact content: </i>
 		Each specification should contain a section on accessibility that describes the benefits and impacts, including ways specification features can be used to address them, and