Document wxTE_MULTILINE support in wxTextEntryDialog.

It wasn't immediately obvious that this dialog could be used for multiline
text entry too so mention it explicitly in the documentation.

Also show this in action in the dialogs sample.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67179 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/textdlg.h

@@ -79,7 +79,8 @@ public:
         @param style
             A dialog style, specifying the buttons (wxOK, wxCANCEL)
             and an optional wxCENTRE style. Additionally, wxTextCtrl styles
-            (such as wxTE_PASSWORD) may be specified here.
+            (such as @c wxTE_PASSWORD or @c wxTE_MULTILINE) may be specified
+            here.
         @param pos
             Dialog position.
     */
@@ -129,6 +130,12 @@ public:
     If @c centre is @true, the message text (which may include new line
     characters) is centred; if @false, the message is left-justified.
 
+    This function is a wrapper around wxTextEntryDialog and while it is usually
+    more convenient to use, using the dialog directly is more flexible, e.g. it
+    allows you to specify the @c wxTE_MULTILINE to allow the user enter
+    multiple lines of text while this function is limited to single line entry
+    only.
+
     @header{wx/textdlg.h}
 */
 wxString wxGetTextFromUser(const wxString& message,