Update file README.rst

docker/README.rst

-This folder contains some docker files.
+This folder contains some docker images.
 
 xaal-debian-dev:
 ================
-This docker image is a an debian distro w/ the xAAL subversion. The default xAAL key is "xAAL".
+This docker image is a an debian distro w/ the xAAL Git. The default xAAL key is "xAAL".
 You can of course launch severals images in parallel to test the protocol itself.
 
 xaal-debian-test: