Add namespace to Doc Example for DNSSRV

[cdesch]

Add missing namespace to Documentation Example for Strategy.Kubernetes.DNSSRV
Reference Issue 163 regarding docs.

Summary of changes

The required field namespace for strategy Strategy.Kubernetes.DNSSRV was missing from the Example in the ModuleDoc. This PR is to add the namespace to the example.

Checklist

• New functions have typespecs, changed functions were updated
• Same for documentation, including moduledocs
• Tests were added or updated to cover changes
• Commits were squashed into a single coherent commit
• [] Notes added to CHANGELOG file which describe changes at a high-level