improve wording in router docs (react-navigation#2894)

vonovak · web-flow · commit b9d1d0d02148 · 2017-11-03T20:59:00.000+01:00
diff --git a/docs/api/routers/Routers.md b/docs/api/routers/Routers.md
@@ -13,7 +13,7 @@ Routers define a component's navigation state, and they allow the developer to d
 
 ## Using Routers
 
-To make a navigator manually, put a static `router` on a component. (To quickly make a navigator with a built-in component, it may be easier to use a [Navigator Factory](/docs/navigators) instead)
+To make a navigator manually, put a static `router` on a component. (To quickly make a navigator with a built-in component, it may be easier to use a [built-in navigator](/docs/navigators) instead)
 
 ```js
 class MyNavigator extends React.Component {
