Update doc

doc/rewriting-services.md

@@ -89,10 +89,7 @@ still pass.
 the route using a `pattern`. A `pattern` (e.g. `pattern: ':param1/:param2'`) is
 the simplest way to declare the route, also the most readable, and will be
 useful for displaying a badge builder with fields in the front end and
-generating badge URLs programmatically. One limitation to keep in mind is that,
-at present, the trailing parameter of a pattern can't be optional. If the last
-part of a route is optional, like a branch, you will need to use a `format`
-regex string (e.g. `format: '([^/]+/[^/]+)'`).
+generating badge URLs programmatically.
 
 3. When creating the initial route, you can stub out the service. A minimal
 service extends BaseJsonService (or BaseService, or one of the others), and