feat(router-store) Add base router selectors

- update documentation based off review

modules/router-store/spec/router_selectors.spec.ts

@@ -1,7 +1,7 @@
 import { RouterReducerState, getSelectors } from '@ngrx/router-store';
 import { RouterStateSelectors } from '../src/models';
 
-let mockData = {
+const mockData = {
   state: {
     root: {
       params: {},

projects/ngrx.io/content/guide/router-store/selectors.md

@@ -1,8 +1,11 @@
-## Router selectors
+# Router selectors
 
-The `getSelectors` method supplied within `@ngrx/router-store` provides functions for selecting information from router state.
+The `getSelectors` method supplied within `@ngrx/router-store` provides functions for selecting common information from the router state.
 
-The `getSelectors` method takes a selector function as its only argument to select the piece of state.
+The `getSelectors` method takes a selector function as its only argument to select the piece of state where the router state is being stored.
+The example below shows how to provide a selector for the top level `router` key in your state object.
+
+**Note:** The `getSelectors` method works with the `routerReducer` provided by `@ngrx/router-store`. If you use a custom serializer, you'll need to provide your own selectors if they do not adhere to `RouterReducerState`.
 
 Usage:
 
@@ -21,21 +24,10 @@ export const selectRouter = createFeatureSelector<
 >('router');
 
 const {
-  selectQueryParams,
-  selectRouteParams,
-  selectRouteData,
-  selectUrl,
+  selectQueryParams,    // select the current route query params
+  selectRouteParams,    // select the current route params
+  selectRouteData,      // select the current route data
+  selectUrl,            // select the current url
 } = getSelectors(selectRouter);
 
-// select the current url
-export const selectCurrentUrl = selectUrl;
-
-// select the current route query params
-export const selectCurrentQueryParams = selectQueryParams;
-
-// select the current route data
-export const selectCurrentRouteData = selectRouteData;
-
-// select the current route params
-export const selectCurrentRouteParams = selectRouteParams;
 ```

projects/ngrx.io/content/navigation.json

@@ -192,13 +192,13 @@
           "title": "Actions",
           "url": "guide/router-store/actions"
         },
-        {
-          "title": "Configuration",
-          "url": "guide/router-store/configuration"
-        },
         {
           "title": "Selectors",
           "url": "guide/router-store/selectors"
+        },
+        {
+          "title": "Configuration",
+          "url": "guide/router-store/configuration"
         }
       ]
     },