Document wxString::operator<<(wxUniChar).

wxUniChar overload was somehow omitted from the list.

Closes #11568.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62996 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/string.h

@@ -584,6 +584,7 @@ public:
     wxString& operator<<(wchar_t ch);
     wxString& operator<<(const wxCharBuffer& s);
     wxString& operator<<(const wxWCharBuffer& s);
+    wxString& operator<<(wxUniChar ch);
     wxString& operator<<(wxUniCharRef ch);
     wxString& operator<<(unsigned int ui);
     wxString& operator<<(long l);