message: docs(dropdown): add missing sections to Api Reference
  Added section BsDropdownState
  Added section BsDropdownContainerComponent
diff: @@ -138,6 +138,11 @@ export const demoComponentContent: ContentSection[] = [
  anchor: 'dropdown-directive',
  outlet: NgApiDocComponent
  },
  + {
  + title: 'BsDropdownContainerComponent',
  + anchor: 'dropdown-container',
  + outlet: NgApiDocComponent
  + },
  {
  title: 'BsDropdownMenuDirective',
  anchor: 'dropdown-menu-directive',
  @@ -148,6 +153,11 @@ export const demoComponentContent: ContentSection[] = [
  anchor: 'dropdown-toggle-directive',
  outlet: NgApiDocComponent
  },
  + {
  + title: 'BsDropdownState',
  + anchor: 'BsDropdownState',
  + outlet: NgApiDocConfigComponent
  + },
  {
  title: 'BsDropdownConfig',
  anchor: 'dropdown-config',
  