Document mounting multiple routes in guide.

Also mention that a route's rank is displayed in brackets.

Closes #983.
Closes #981.

site/guide/3-overview.md

@@ -86,8 +86,9 @@ fn main() {
 
 The `mount` method takes as input:
 
-   1. A _base_ path to namespace a list of routes under.
-   2. A list of routes via the `routes!` macro.
+   1. A _base_ path to namespace a list of routes under, here, `"/hello"`.
+   2. A list of routes via the `routes!` macro: here, `routes![world]`, with
+      multiple routes: `routes![a, b, c]`.
 
 This creates a new `Rocket` instance via the `ignite` function and mounts the
 `world` route to the `"/hello"` path, making Rocket aware of the route. `GET`
@@ -108,11 +109,16 @@ mod other {
     }
 }
 
+#[get("/hello")]
+pub fn hello() -> &'static str {
+    "Hello, outside world!"
+}
+
 use other::world;
 
 fn main() {
   // error[E0425]: cannot find value `static_rocket_route_info_for_world` in this scope
-  rocket::ignite().mount("/hello", routes![world]);
+  rocket::ignite().mount("/hello", routes![hello, world]);
 }
 ```
 
@@ -121,7 +127,7 @@ into the name of a structure generated by Rocket's code generation. The solution
 is to refer to the route using a namespaced path instead:
 
 ```rust
-rocket::ignite().mount("/hello", routes![other::world]);
+rocket::ignite().mount("/hello", routes![hello, other::world]);
 ```
 
 ## Launching

site/guide/4-requests.md

@@ -190,11 +190,18 @@ fn user_int(id: isize) -> T { ... }
 
 #[get("/user/<id>", rank = 3)]
 fn user_str(id: &RawStr) -> T { ... }
+
+fn main() {
+    rocket::ignite()
+        .mount("/", routes![user, user_int, user_str])
+        .launch();
+}
 ```
 
 Notice the `rank` parameters in `user_int` and `user_str`. If we run this
-application with the routes mounted at the root, requests to `/user/<id>` will
-be routed as follows:
+application with the routes mounted at the root path, as is done in `main`
+above, requests to `/user/<id>` (such as `/user/123`, `/user/Bob`, and so on)
+will be routed as follows:
 
   1. The `user` route matches first. If the string at the `<id>` position is an
      unsigned integer, then the `user` handler is called. If it is not, then the
@@ -206,6 +213,11 @@ be routed as follows:
   3. The `user_str` route matches last. Since `<id>` is a always string, the
      route always matches. The `user_str` handler is called.
 
+! note: A route's rank appears in **[brackets]** during launch.
+
+  You'll also find a route's rank logged in brackets during application launch:
+  `GET /user/<id> [3] (user_str)`.
+
 Forwards can be _caught_ by using a `Result` or `Option` type. For example, if
 the type of `id` in the `user` function was `Result<usize, &RawStr>`, then `user`
 would never forward. An `Ok` variant would indicate that `<id>` was a valid