rename included files to not have ".rst" extension,
otherwise they are being scanned for ref targets and found targets are
effectively counted twice (both in file that includes,
and in the file being included), producing a warning/error.
Change-Id: I2eec5b1b16d253998f45e6f0551a92c2ab6f5609
Closes-Bug: #1743780
0970e3d031