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

Closes #4816

modules/angular2/src/core/forms/directives.ts

@@ -38,7 +38,7 @@ export {NgControlStatus} from './directives/ng_control_status';
  *
  *  This is a shorthand for importing them each individually.
  *
- * ### Example:
+ * ### Example
  *
  * ```typescript
  * @Component({

modules/angular2/src/core/forms/directives/checkbox_value_accessor.ts

@@ -13,7 +13,7 @@ const CHECKBOX_VALUE_ACCESSOR = CONST_EXPR(new Provider(
 /**
  * The accessor for writing a value and listening to changes on a checkbox input element.
  *
- *  # Example
+ *  ### Example
  *  ```
  *  <input type="checkbox" [ng-control]="rememberLogin">
  *  ```

modules/angular2/src/core/forms/directives/default_value_accessor.ts

@@ -13,7 +13,7 @@ const DEFAULT_VALUE_ACCESSOR = CONST_EXPR(new Provider(
  * The default accessor for writing a value and listening to changes that is used by the
  * {@link NgModel}, {@link NgFormControl}, and {@link NgControlName} directives.
  *
- *  # Example
+ *  ### Example
  *  ```
  *  <input type="text" [(ng-model)]="searchQuery">
  *  ```

modules/angular2/src/core/forms/directives/ng_control_group.ts

@@ -17,7 +17,7 @@ const controlGroupBinding =
  *
  * This directive can only be used as a child of {@link NgForm} or {@link NgFormModel}.
  *
- * # Example
+ * ### Example
  *
  * In this example, we create the credentials and personal control groups.
  * We can work with each group separately: check its validity, get its value, listen to its changes.

modules/angular2/src/core/forms/directives/ng_control_name.ts

@@ -21,7 +21,7 @@ const controlNameBinding =
  *
  * This directive can only be used as a child of {@link NgForm} or {@link NgFormModel}.
 
- * # Example
+ * ### Example
  *
  * In this example, we create the login and password controls.
  * We can work with each control separately: check its validity, get its value, listen to its

modules/angular2/src/core/forms/directives/ng_form.ts

@@ -22,19 +22,19 @@ const formDirectiveProvider =
  * If `NgForm` is bound in a component, `<form>` elements in that component will be
  * upgraded to use the Angular form system.
  *
- * # Typical Use
+ *##Typical Use
  *
  * Include `FORM_DIRECTIVES` in the `directives` section of a {@link View} annotation
  * to use `NgForm` and its associated controls.
  *
- * # Structure
+ *##Structure
  *
  * An Angular form is a collection of `Control`s in some hierarchy.
  * `Control`s can be at the top level or can be organized in `ControlGroup`s
  * or `ControlArray`s. This hierarchy is reflected in the form's `value`, a
  * JSON object that mirrors the form structure.
  *
- * # Submission
+ *##Submission
  *
  * The `ng-submit` event signals when the user triggers a form submission.
  *

modules/angular2/src/core/forms/directives/ng_form_control.ts

@@ -42,7 +42,7 @@ const formControlBinding =
  * }
  *  ```
  *
- * # ng-model
+ *##ng-model
  *
  * We can also use `ng-model` to bind a domain model to the form.
  *

modules/angular2/src/core/forms/directives/ng_model.ts

@@ -16,7 +16,7 @@ const formControlBinding =
 /**
  * Binds a domain model to a form control.
  *
- * # Usage
+ *##Usage
  *
  * `ng-model` binds an existing domain model to a form control. For a
  * two-way binding, use `[(ng-model)]` to ensure the model updates in

modules/angular2/src/core/forms/directives/number_value_accessor.ts

@@ -13,7 +13,7 @@ const NUMBER_VALUE_ACCESSOR = CONST_EXPR(new Provider(
  * The accessor for writing a number value and listening to changes that is used by the
  * {@link NgModel}, {@link NgFormControl}, and {@link NgControlName} directives.
  *
- *  # Example
+ *  ### Example
  *  ```
  *  <input type="number" [(ng-model)]="age">
  *  ```

modules/angular2/src/core/forms/directives/select_control_value_accessor.ts

@@ -14,7 +14,7 @@ const SELECT_VALUE_ACCESSOR = CONST_EXPR(new Provider(
 /**
  * Marks `<option>` as dynamic, so Angular can be notified when options change.
  *
- * #Example:
+ * ### Example
  *
  * ```
  * <select ng-control="city">

modules/angular2/src/core/forms/form_builder.ts

@@ -7,7 +7,7 @@ import * as modelModule from './model';
 /**
  * Creates a form object from a user-specified configuration.
  *
- * # Example
+ * ### Example
  *
  * ```
  * import {Component, bootstrap} from 'angular2/angular2';

modules/angular2/src/core/forms/model.ts

@@ -38,7 +38,7 @@ function _find(control: AbstractControl, path: Array<string | number>| string) {
 }
 
 /**
- * Omitting from external API doc as this is really an abstract internal concept.
+ *
  */
 export class AbstractControl {
   /** @internal */
@@ -145,7 +145,7 @@ export class AbstractControl {
  * `Control` is one of the three fundamental building blocks used to define forms in Angular, along
  * with {@link ControlGroup} and {@link ControlArray}.
  *
- * # Usage
+ *##Usage
  *
  * By default, a `Control` is created for every `<input>` or other form component.
  * With {@link NgFormControl} or {@link NgFormModel} an existing {@link Control} can be
@@ -287,7 +287,7 @@ export class ControlGroup extends AbstractControl {
  * along with {@link Control} and {@link ControlGroup}. {@link ControlGroup} can also contain
  * other controls, but is of fixed length.
  *
- * # Adding or removing controls
+ *##Adding or removing controls
  *
  * To change the controls in the array, use the `push`, `insert`, or `removeAt` methods
  * in `ControlArray` itself. These methods ensure the controls are properly tracked in the

modules/angular2/src/core/forms/validators.ts

@@ -10,7 +10,7 @@ export const NG_VALIDATORS: OpaqueToken = CONST_EXPR(new OpaqueToken("NgValidato
 /**
  * Provides a set of validators used by form controls.
  *
- * # Example
+ * ### Example
  *
  * ```
  * var loginControl = new Control("", Validators.required)