docs(ng-if): fix some missed occurrences of if, for, switch in docs

modules/angular2/src/core/annotations_impl/annotations.ts

@@ -213,11 +213,10 @@ import {DEFAULT} from 'angular2/change_detection';
  *
  *
  * A directive can also query for other child directives. Since parent directives are instantiated
- * before child
+ * before child directives, a directive can't simply inject the list of child directives. Instead,
- * directives, a directive can't simply inject the list of child directives. Instead, the directive
+ * the directive injects a {@link QueryList}, which updates its contents as children are added,
- * injects a {@link QueryList}, which updates its contents as children are added, removed, or moved
+ * removed, or moved by a directive that uses a {@link ViewContainerRef} such as a `ng-for`, an
- * by a directive
+ * `ng-if`, or an `ng-switch`.
- * that uses a {@link ViewContainerRef} such as a `for`, an `if`, or a `switch`.
  *
  * ```
  * @Directive({ selector: '[my-directive]' })
@@ -228,8 +227,7 @@ import {DEFAULT} from 'angular2/change_detection';
  * ```
  *
  * This directive would be instantiated with a {@link QueryList} which contains `Dependency` 4 and
- * 6. Here, `Dependency`
+ * 6. Here, `Dependency` 5 would not be included, because it is not a direct child.
- * 5 would not be included, because it is not a direct child.
  *
  * ### Injecting a live collection of descendant directives
  *

modules/angular2/src/directives/ng_if.ts

@@ -5,9 +5,8 @@ import {isBlank} from 'angular2/src/facade/lang';
 /**
  * Removes or recreates a portion of the DOM tree based on an {expression}.
  *
- * If the expression assigned to `if` evaluates to a false value then the element is removed from
+ * If the expression assigned to `ng-if` evaluates to a false value then the element
- * the
+ * is removed from the DOM, otherwise a clone of the element is reinserted into the DOM.
- * DOM, otherwise a clone of the element is reinserted into the DOM.
  *
  * # Example:
  *

modules/angular2/src/directives/ng_switch.ts

@@ -179,7 +179,7 @@ export class NgSwitchWhen {
 /**
  * Defines a default case statement.
  *
- * Default case statements are displayed when no `NgSwitchWhen` match the `switch` value.
+ * Default case statements are displayed when no `NgSwitchWhen` match the `ng-switch` value.
  *
  * Example:
  *