Docs: Describe PageModel.navigationDescription (#7111)

src/page.ts

@@ -47,7 +47,7 @@ export class PageModel extends PanelModelBase implements IPage {
     return this.survey && (<any>this.survey).showPageTitles;
   }
   /**
-   * A caption displayed on a navigation button in the TOC or progress bar. Applies when [`showTOC`](https://surveyjs.io/form-library/documentation/api-reference/survey-data-model#showTOC) is `true` or when [`showProgressBar`](https://surveyjs.io/form-library/documentation/surveymodel#showProgressBar) is `true` and [`progressBarType`](https://surveyjs.io/form-library/documentation/surveymodel#progressBarType) is `"buttons"`.
+   * A caption displayed on a navigation button in the TOC or progress bar. Applies when [`showTOC`](https://surveyjs.io/form-library/documentation/api-reference/survey-data-model#showTOC) is `true` or when the [progress bar is visible](https://surveyjs.io/form-library/documentation/api-reference/survey-data-model#showProgressBar) and [`progressBarType`](https://surveyjs.io/form-library/documentation/surveymodel#progressBarType) is set to `"buttons"`.
    *
    * If navigation titles are unspecified, the navigation buttons display page [titles](https://surveyjs.io/form-library/documentation/api-reference/page-model#title) or [names](https://surveyjs.io/form-library/documentation/pagemodel#name).
    */
@@ -60,6 +60,9 @@ export class PageModel extends PanelModelBase implements IPage {
   public get locNavigationTitle(): LocalizableString {
     return this.getLocalizableString("navigationTitle");
   }
+  /**
+   * Explanatory text displayed under a navigation button in the progress bar. Applies when the [progress bar is visible](https://surveyjs.io/form-library/documentation/api-reference/survey-data-model#showProgressBar) and `SurveyModel`'s [`progressBarType`](https://surveyjs.io/form-library/documentation/surveymodel#progressBarType) property is set to `"buttons"`.
+   */
   public get navigationDescription(): string {
     return this.getLocalizableStringText("navigationDescription");
   }