Updated SDRangel pictures and videos (markdown)

SDRangel-pictures-and-videos.md

@@ -1,4 +1,7 @@
 # SDRangel
+
+## General
+
 ![Cover](https://github.com/f4exb/sdrangel/blob/master/doc/img/sdrangel_cover.png)
 Channel analyzer view
 
@@ -6,6 +9,8 @@ See [this video](https://youtu.be/cy0D-x7K4VI) for SDRangel in action on a fast
 
 See [this other video](https://youtu.be/klmJxdExHnE) of watching a FM pulsed signal in the 868 MHz ISM band. The view in the channel scope stacks the power above the phase showing the phase modulation in the signal. Here also the old channel analyzer was used.
 
+## ATV and DATV
+
 See [this video](https://www.youtube.com/watch?v=bfqJHVmOGn0) from my friend Evariste F5OEO showing the QPSK constellation of a DATV transmission. As the analyzer is generic there is no provision for de-rotating but the figure is quite visible. Alternatively you could use the scope memory feature to "take" a still image.
 
-Se [this picture](http://www.von-info.ch/hb9afo/histoire/20170325_DATV%20Nimes/20170325_5586_SDRangel.jpg) of the author presenting the [ATV Demodulator](https://github.com/f4exb/sdrangel/tree/master/plugins/channelrx/demodatv) and [Modulator](https://github.com/f4exb/sdrangel/tree/master/plugins/channeltx/modatv) for amateur analog television during the last ATV meeting in Nimes, France. Thanks Michel for the picture! 
+See [this picture](http://www.von-info.ch/hb9afo/histoire/20170325_DATV%20Nimes/20170325_5586_SDRangel.jpg) of the author presenting the [ATV Demodulator](https://github.com/f4exb/sdrangel/tree/master/plugins/channelrx/demodatv) and [Modulator](https://github.com/f4exb/sdrangel/tree/master/plugins/channeltx/modatv) for amateur analog television during the last ATV meeting in Nimes, France. Thanks Michel for the picture!