Fix (?) to shared-db testing in microservices.md (#1937)

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.".

---------

Co-authored-by: René Jeglinsky <rene.jeglinsky@sap.com>

Author: qmacro

guides/deployment/microservices.md

@@ -159,10 +159,10 @@ cd shared-db
 ```
 
 ```sh
-cds db -2 sql
+cds compile db -2 sql
 ```
 ```sh
-cds db -2 hana
+cds compile db -2 hana
 ```
 
 ```sh