firmware-updates: align apt upgrade to apt full-upgrade

Because 'apt-get upgrade' or 'apt upgrade' will not pull in potential
new dependencies and that could lead to a broken system.
'apt-get dist-ugprade' or 'apt full-upgrade' will install new
dependencies when needed.

Signed-off-by: Aaron Lauterer <[email protected]>

Author: aaronlauterer

firmware-updates.adoc

@@ -206,6 +206,6 @@ intel-microcode set on hold.
 ----
 # apt-mark unhold intel-microcode
 # apt update
-# apt upgrade
+# apt full-upgrade
 ----
 ====