Add MenuItem notices to BrowserWindowOpener documentation (#10820)

documentation/advanced/advanced-printing.asciidoc

@@ -107,12 +107,12 @@ To print content as PDF, you need to provide the downloadable content as a
 static or a dynamic resource, such as a [classname]#StreamResource#.
 
 You can let the user open the resource using a [classname]#Link# component, or
-some other component with a [classname]#PopupWindowOpener# extension. When such
+some other component with a [classname]#BrowserWindowOpener# extension. When such
 a link or opener is clicked, the browser opens the PDF in the browser, in an
 external viewer (such as Adobe Reader), or lets the user save the document.
 
 It is crucial to notice that clicking a [classname]#Link# or a
-[classname]#PopupWindowOpener# is a client-side operation. If you get the
+[classname]#BrowserWindowOpener# is a client-side operation. If you get the
 content of the dynamic PDF from the same UI state, you can not have the link or
 opener enabled, as then clicking it would not get the current UI content.
 Instead, you have to create the resource object before the link or opener are

documentation/advanced/advanced-windows.asciidoc

@@ -93,7 +93,7 @@ public static class MyPopupUI extends UI {
 === Popping It Up
 
 A popup window is opened using the [classname]#BrowserWindowOpener# extension,
-which you can attach to any component. The constructor of the extension takes
+which you can attach to any component or `MenuItem`. The constructor of the extension takes
 the class object of the UI class to be opened as a parameter.
 
 You can configure the features of the popup window with

documentation/articles/OpeningAUIInAPopupWindow.asciidoc

@@ -10,7 +10,7 @@ Opening a UI in a popup window
 
 To open a new popup window in the browser showing another part of your
 application, you can use the new `BrowserWindowOpener` extension. Any
-component that you extend with `BrowserWindowOpener` will make clicking
+component or `MenuItem` that you extend with `BrowserWindowOpener` will make clicking
 the component open a new browser window with some options for the
 content. Opening a popup this way helps you bypass most popup blockers.