Add note about Fedora RPM macros in %files section

src/stub

             echo "        PREFIX based paths (eg. /usr/bin) in this file should"
             echo "        should be as if PREFIX was /usr."
             echo ""
+            echo "        In case of Fedora-based distro, you should make use"
+            echo "        of RPM macros:"
+            echo ""
+            echo "            https://fedoraproject.org/wiki/Packaging:RPMMacros"
+            echo ""
             echo "    Refer to these documents for further details:"
             echo ""
             echo "        http://rpm-guide.readthedocs.io/"