Fix (?) to shared-db testing in microservices.md

[qmacro]

The cds db -2 sql and cds db -2 hana commands are a bit suspect, as the db command doesn't exist. From the paragraph just before these commands, I suspect this should be compile, but even then, we need also to specify the --all option, otherwise we get the message "You must specify a model to compile.".

[vl-leon]

cds db -2 sql worked in cds 8, but in cds 9 it does not.

compile is the default command, it is documented (cds -h):
cds <src> = cds compile <src>

I would prefer to specify that we do compile the model, meaning cds compile db -2 sql

It looks also as a regression: cds db should resolve to cds compile db.

[vl-leon]

I do not see the --all option documented in cds 9, see cds help compile
Documented are -s all and -l all

[renejeglinsky]

Why not use cds compile, so the full command? Is there a need to use the shortcut/default? If not, we should not make our users guess/research what we mean.

[vl-leon]

cds compile db -2 sql works

[renejeglinsky]

Proposal following @vl-leon's comment