message: docs: add input docs
  PR Close
diff: @@ -160,12 +160,18 @@ export class NgIf {
  this._thenTemplateRef = templateRef;
  }
  + /**
  + * The Boolean expression to evaluate as the condition for showing a template.
  + */
  @Input()
  set ngIf(condition: any) {
  this._context.$implicit = this._context.ngIf = condition;
  this._updateView();
  }
  + /**
  + * A template to show if the condition expression evaluates to true.
  + */
  @Input()
  set ngIfThen(templateRef: TemplateRef<NgIfContext>|null) {
  assertTemplate('ngIfThen', templateRef);
  @@ -174,6 +180,9 @@ export class NgIf {
  this._updateView();
  }
  + /**
  + * A template to show if the condition expression evaluates to false.
  + */
  @Input()
  set ngIfElse(templateRef: TemplateRef<NgIfContext>|null) {
  assertTemplate('ngIfElse', templateRef);
  