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

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
- * the
- * DOM, otherwise a clone of the element is reinserted into the DOM.
+ * If the expression assigned to `ng-if` evaluates to a false value then the element
+ * is removed from the 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:
  *