aemfvp-a-rme: update user-guide to rme docker files

container-scripts has been updated to contain docker scripts
for both rme and non-rme stack this change will update
documentation to locate container scripts in aemfvp-a-rme dir

Signed-off-by: Nitin Sharma <nitin.sharma3@arm.com>
Change-Id: I7c982fb0d15fb1334f9bb84e9ba13ab5064ae028