docs(router): changes suggested by Deb Kurata in #1808

public/docs/_examples/router/ts/app/auth.guard.ts

@@ -1,20 +1,13 @@
 // #docregion
 import { Injectable }          from '@angular/core';
-import { CanActivate,
-         Router,
-         ActivatedRouteSnapshot,
-         RouterStateSnapshot }    from '@angular/router';
+import { CanActivate, Router } from '@angular/router';
 import { AuthService }         from './auth.service';
 
 @Injectable()
 export class AuthGuard implements CanActivate {
   constructor(private authService: AuthService, private router: Router) {}
 
-  canActivate(
-    // Not using but worth knowing about
-    next:  ActivatedRouteSnapshot,
-    state: RouterStateSnapshot
-  ) {
+  canActivate() {
     if (this.authService.isLoggedIn) { return true; }
     this.router.navigate(['/login']);
     return false;

public/docs/ts/latest/guide/router.jade

@@ -1052,7 +1052,7 @@ h2#guards Route Guards
     We'll examine other router guards in a future update to this chapter.
 :marked
   We can have multiple guards at every level of a routing hierarchy.
-  The router checks the `CanDeactive` guards first, from deepest child route to the top.
+  The router checks the `CanDeactivate` guards first, from deepest child route to the top.
   Then it checks the `CanActivate` guards from the top down to the deepest child route.
   If _any_ guard returns false, pending guards that have not completed will be canceled,
   and the entire navigation is canceled.