doc: Update the user guide use-case reproduce instructions

This patch:

  * Uses consistent terms to refer to baremetal and virtualization distribution
    images
  * Adds that the images should be rebooted before running the use-case
    instructions
  * Adds example output for each of the commands, to be clearer about what is
    expected
  * Provides instructions for how to stop application workloads, when
    recommending the reader to do so
  * Sets a name when the the Docker container is created, to support the
    subsequent stop instructions
  * Clarify which commands should be executed on the Control VM, and which
    commands should be executed on the Guest VM, using a consistent format

Issue-Id: SCM-4397
Signed-off-by: Richard Neill <richard.neill@arm.com>
Change-Id: Ieec1018e2d1c9fe1864161fd48602f220ed71843