mariadb-client possible command failure note for ipv6

Include in note about mariadb-client possible command failure case
of ipv6 environments. In those type of environments mysql command may
also result in timeout.

Documents: OSPRH-27604

Signed-off-by: Mikołaj Ciecierski <mikolaj.ciecierski@redhat.com>

Author: ciecierski

docs_user/modules/proc_retrieving-topology-specific-service-configuration.adoc

@@ -189,7 +189,9 @@ $ oc rsh mariadb-client mysql -rsh "${SOURCE_MARIADB_IP[default]}" -uroot -p"${S
 ====
 For BGP-enabled environments, this command might take a few moments to succeed while BGP routes are advertised and propagated through the network. The `mariadb-client` pod needs to receive the route to the source MariaDB IP address through BGP before it can establish a connection. If the command fails, wait a few seconds and retry. The connection should succeed once the BGP route advertisement is complete.
 
-For standard (non-BGP) deployments, this command should succeed immediately.
+For IPv6 environments, this command might take a few moments to succeed while the network IPv6 stack completes its setup. If the command fails, wait a few seconds and retry.
+
+For standard deployments, such as non-BGP deployments or IPv4 deployments, this command should succeed immediately.
 ====
 
 . Export the shell variables for the following outputs and test the connection to the {OpenStackShort} database: