cockroachdb: docs: unified formatting and style

This is the first phase CockroachDB part of three phases to improve and
rework the Rook documentation for better user accessibility to the Rook
projects and  with that the storage providers.
Phase two is about automatic generation of CRD documentation and phase
three is about reworking the docs themselves and, e.g., examples for
CRDs and certain use cases.

Signed-off-by: Alexander Trost <galexrt@googlemail.com>

Documentation/cockroachdb.md

@@ -63,7 +63,8 @@ kubectl -n rook-cockroachdb-system exec -it $(kubectl -n rook-cockroachdb-system
 ```
 
 This will land you in a prompt where you can begin to run SQL commands directly on the database cluster.
-For example:
+
+**Example**:
 
 ```console
 root@cockroachdb-public.rook-cockroachdb:26257/> show databases;
@@ -108,7 +109,7 @@ kubectl -n rook-cockroachdb-system exec -it $(kubectl -n rook-cockroachdb-system
 
 To clean up all resources associated with this walk-through, you can run the commands below.
 
-**NOTE:** that this will destroy your database and delete all of its associated data.
+> **NOTE**: that this will destroy your database and delete all of its associated data.
 
 ```console
 kubectl delete -f loadgen-kv.yaml