Merge branch 'master' into master

public/docs/ts/latest/tutorial/toh-pt6.jade

@@ -366,6 +366,7 @@ h1 Providing HTTP Services
   But requests aren't always done only once.
   You may start one request,
   cancel it, and make a different request before the server has responded to the first request.
+
   A *request-cancel-new-request* sequence is difficult to implement with `Promise`s, but
   easy with `Observable`s.
 
@@ -381,7 +382,7 @@ h1 Providing HTTP Services
   The `http.get()` call in `HeroSearchService` is similar to the one
   in the `HeroService`, although the URL now has a query string.
 
-  <span if-docs="ts">More importantly, you no longer call `toPromise()`.
+  More importantly, you no longer call `toPromise()`.
   Instead you return the *Observable* from the the `http.get()`,
   after chaining it to another RxJS operator, <code>map()</code>,
   to extract heroes from the response data.