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

samples/dialogs/dialogs.h

@@ -379,6 +379,7 @@ public:
     void Rearrange(wxCommandEvent& event);
 
 #if wxUSE_TEXTDLG
+    void LineEntry(wxCommandEvent& event);
     void TextEntry(wxCommandEvent& event);
     void PasswordEntry(wxCommandEvent& event);
 #endif // wxUSE_TEXTDLG
@@ -534,6 +535,7 @@ enum
     DIALOGS_SINGLE_CHOICE,
     DIALOGS_MULTI_CHOICE,
     DIALOGS_REARRANGE,
+    DIALOGS_LINE_ENTRY,
     DIALOGS_TEXT_ENTRY,
     DIALOGS_PASSWORD_ENTRY,
     DIALOGS_FILE_OPEN,