Update the "Enable S5 in ACRN" tutorial to:
* Make the language clearer at places
* Consistent use of "Lifecycle Manager" and "life_mngr"
* Change "ACK" to "ACKED"
* Use a ReST reference to point at the architectural diagram
* Update build instructions
* Replace 'literalinclude' by static code-blocks to avoid the
content going out of date
Signed-off-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
e18d99ef65