docs(router): add missing backticks (#2366)

Author: sarunint

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

@@ -1365,13 +1365,13 @@ a#child-routing-component
   They *extend* the path of the parent route.
   With each step down the route tree, we add a slash followed by the route path (unless the route path is _empty_).
 
-  For example, the parent path to the `CrisisCenterComponent` is `/crisis-center
-  The router appends these child paths to the parent path to the `CrisisCenterComponent` (`/crisis-center).
+  For example, the parent path to the `CrisisCenterComponent` is `/crisis-center`
+  The router appends these child paths to the parent path to the `CrisisCenterComponent` (`/crisis-center`).
 
-  * to navigate to the `CrisisCenterHomeComponent, the full URL is `/crisis-center` (/crisis-center` + `''` + `''`).
+  * to navigate to the `CrisisCenterHomeComponent`, the full URL is `/crisis-center` (`/crisis-center` + `''` + `''`).
 
   * to navigate to the `CrisisDetailComponent` for a crisis with `id=2`, the full URL is
-  `/crisis-center/2` (/crisis-center` + `''` + `'/2'`).
+  `/crisis-center/2` (`/crisis-center` + `''` + `'/2'`).
 
   The absolute URL for the latter example, including the origin, is
 code-example.