docs(chore): make styles consistent for API doc headings

Closes #4816

modules/angular2/src/router/hash_location_strategy.ts

@@ -12,7 +12,7 @@ import {EventListener, History, Location} from 'angular2/src/core/facade/browser
  * For instance, if you call `location.go('/foo')`, the browser's URL will become
  * `example.com#/foo`.
  *
- * ## Example
+ * ### Example
  *
  * ```
  * import {Component, View} from 'angular2/angular2';

modules/angular2/src/router/instruction.ts

@@ -12,7 +12,7 @@ import {Url} from './url_parser';
  *
  * You can inject `RouteParams` into the constructor of a component to use it.
  *
- * ## Example
+ * ### Example
  *
  * ```
  * import {bootstrap, Component} from 'angular2/angular2';
@@ -48,7 +48,7 @@ export class RouteParams {
  * `Instruction`s can be created using {@link Router#generate}, and can be used to
  * perform route changes with {@link Router#navigateByInstruction}.
  *
- * ## Example
+ * ### Example
  *
  * ```
  * import {bootstrap, Component} from 'angular2/angular2';

modules/angular2/src/router/interfaces.ts

@@ -21,7 +21,7 @@ var __ignore_me = global;
  * If `onActivate` returns a promise, the route change will wait until the promise settles to
  * instantiate and activate child components.
  *
- * ## Example
+ * ### Example
  * ```
  * import {Component} from 'angular2/angular2';
  * import {OnActivate, ComponentInstruction} from 'angular2/router';
@@ -52,7 +52,7 @@ export interface OnActivate {
  * representing the current route being navigated to, and the second parameter representing the
  * previous route or `null`.
  *
- * ## Example
+ * ### Example
  * ```
  * import {Component} from 'angular2/angular2';
  * import {CanReuse, OnReuse, ComponentInstruction} from 'angular2/router';
@@ -86,7 +86,7 @@ export interface OnReuse {
  *
  * If `onDeactivate` returns a promise, the route change will wait until the promise settles.
  *
- * ## Example
+ * ### Example
  * ```
  * import {Component} from 'angular2/angular2';
  * import {OnDeactivate, ComponentInstruction} from 'angular2/router';
@@ -121,7 +121,7 @@ export interface OnDeactivate {
  *
  * If `canReuse` throws or rejects, the navigation will be cancelled.
  *
- * ## Example
+ * ### Example
  * ```
  * import {Component} from 'angular2/angular2';
  * import {CanReuse, OnReuse, ComponentInstruction} from 'angular2/router';
@@ -159,7 +159,7 @@ export interface CanReuse {
  *
  * If `canDeactivate` throws or rejects, the navigation is also cancelled.
  *
- * ## Example
+ * ### Example
  * ```
  * import {Component} from 'angular2/angular2';
  * import {CanDeactivate, ComponentInstruction} from 'angular2/router';

modules/angular2/src/router/lifecycle_annotations.ts

@@ -33,7 +33,7 @@ export {
  * If `CanActivate` returns or resolves to `true`, navigation continues, the component is
  * instantiated, and the {@link OnActivate} hook of that component is called if implemented.
  *
- * ## Example
+ * ### Example
  * ```
  * import {Component} from 'angular2/angular2';
  * import {CanActivate} from 'angular2/router';

modules/angular2/src/router/location.ts

@@ -13,7 +13,7 @@ import {OpaqueToken, Injectable, Optional, Inject} from 'angular2/angular2';
  * representing the URL prefix that should be preserved when generating and recognizing
  * URLs.
  *
- * ## Example
+ * ### Example
  *
  * ```
  * import {Component} from 'angular2/angular2';
@@ -52,7 +52,7 @@ export const APP_BASE_HREF: OpaqueToken = CONST_EXPR(new OpaqueToken('appBaseHre
  * - `my/app/user/123` **is not** normalized
  * - `/my/app/user/123/` **is not** normalized
  *
- * ## Example
+ * ### Example
  *
  * ```
  * import {Component} from 'angular2/angular2';

modules/angular2/src/router/path_location_strategy.ts

@@ -20,7 +20,7 @@ import {LocationStrategy, normalizeQueryParams} from './location_strategy';
  * `location.go('/foo')`, the browser's URL will become
  * `example.com/my/app/foo`.
  *
- * ## Example
+ * ### Example
  *
  * ```
  * import {Component, provide} from 'angular2/angular2';

modules/angular2/src/router/route_config_impl.ts

@@ -22,7 +22,7 @@ export class RouteConfig {
  * - `data` is an optional property of any type representing arbitrary route metadata for the given
  * route. It is injectable via the {@link ROUTE_DATA} token.
  *
- * ## Example
+ * ### Example
  * ```
  * import {RouteConfig} from 'angular2/router';
  *
@@ -62,7 +62,7 @@ export class Route implements RouteDefinition {
  * - `data` is an optional property of any type representing arbitrary route metadata for the given
  * route. It is injectable via the {@link ROUTE_DATA} token.
  *
- * ## Example
+ * ### Example
  * ```
  * import {RouteConfig, AuxRoute} from 'angular2/router';
  *
@@ -99,7 +99,7 @@ export class AuxRoute implements RouteDefinition {
  * - `data` is an optional property of any type representing arbitrary route metadata for the given
  * route. It is injectable via the {@link ROUTE_DATA} token.
  *
- * ## Example
+ * ### Example
  * ```
  * import {RouteConfig} from 'angular2/router';
  *
@@ -131,7 +131,7 @@ export class AsyncRoute implements RouteDefinition {
  * - `path` is a string that uses the route matcher DSL.
  * - `redirectTo` is a string representing the new URL to be matched against.
  *
- * ## Example
+ * ### Example
  * ```
  * import {RouteConfig} from 'angular2/router';
  *

modules/angular2/src/router/router.ts

@@ -141,7 +141,7 @@ export class Router {
   /**
    * Dynamically update the routing configuration and trigger a navigation.
    *
-   * # Usage
+   *##Usage
    *
    * ```
    * router.config([
@@ -160,7 +160,7 @@ export class Router {
    * Navigate based on the provided Route Link DSL. It's preferred to navigate with this method
    * over `navigateByUrl`.
    *
-   * # Usage
+   *##Usage
    *
    * This method takes an array representing the Route Link DSL:
    * ```