Doc: Remove empty section in Qt NFC example overview page

Remove unused section "C++ Tutorial".

Change-Id: I55ba7286c00ae4573d97f6244dff1f589634b949
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

src/nfc/doc/src/examples.qdoc

@@ -34,8 +34,6 @@
 This is a variety of examples that cover the entire range of the Qt NFC API. You will find them
 in their own documentation, but they are also accessible from here.
 
-\section2 C++ Tutorial
-
 \section2 C++ Examples
 \table 80%
     \header