docs(markdown): add missing space between markdown ### and text, turn h1 into h3s, remove bold.

Closes #7996

modules/angular2/src/common/directives/ng_for.ts

@@ -21,7 +21,7 @@ import {BaseException} from "../../facade/exceptions";
  * each instantiated template inherits from the outer context with the given loop variable set
  * to the current item from the iterable.
  *
- * # Local Variables
+ * ### Local Variables
  *
  * `NgFor` provides several exported values that can be aliased to local variables:
  *
@@ -33,7 +33,7 @@ import {BaseException} from "../../facade/exceptions";
  * * `even` will be set to a boolean value indicating whether this item has an even index.
  * * `odd` will be set to a boolean value indicating whether this item has an odd index.
  *
- * # Change Propagation
+ * ### Change Propagation
  *
  * When the contents of the iterator changes, `NgFor` makes the corresponding changes to the DOM:
  *
@@ -56,7 +56,7 @@ import {BaseException} from "../../facade/exceptions";
  * elements were deleted and all new elements inserted). This is an expensive operation and should
  * be avoided if possible.
  *
- * # Syntax
+ * ### Syntax
  *
  * - `<li *ngFor="#item of items; #i = index">...</li>`
  * - `<li template="ngFor #item of items; #i = index">...</li>`

modules/angular2/src/common/directives/ng_switch.ts

@@ -21,7 +21,7 @@ export class SwitchView {
  * `NgSwitch` simply inserts nested elements based on which match expression matches the value
  * obtained from the evaluated switch expression. In other words, you define a container element
  * (where you place the directive with a switch expression on the
- * **`[ngSwitch]="..."` attribute**), define any inner elements inside of the directive and
+ * `[ngSwitch]="..."` attribute), define any inner elements inside of the directive and
  * place a `[ngSwitchWhen]` attribute per element.
  *
  * The `ngSwitchWhen` property is used to inform `NgSwitch` which element to display when the

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

@@ -57,7 +57,7 @@ const formControlBinding =
  * }
  *  ```
  *
- * ###ngModel
+ * ### ngModel
  *
  * We can also use `ngModel` to bind a domain model to the form.
  *