docs: Fix broken discussions link in dev guide

The Getting Help section linked to rossoctl/operator/discussions, but
discussions are disabled on that repo, so the link 404s. Point it at the
umbrella project's discussions page (rossoctl/rossoctl/discussions), which
is enabled and is where project-wide questions belong.

Assisted-By: Claude Code (Anthropic AI) <noreply@anthropic.com>

Signed-off-by: Gloire Rubambiza <gloire@ibm.com>

Author: rubambiza

operator/docs/dev.md

@@ -589,7 +589,7 @@ kubectl delete agentcard my-agent-deployment-card --grace-period=0 --force
 ## Getting Help
 
 - **GitHub Issues**: [Report bugs or request features](https://github.com/rossoctl/operator/issues)
-- **Discussions**: [Ask questions](https://github.com/rossoctl/operator/discussions)
+- **Discussions**: [Ask questions](https://github.com/rossoctl/rossoctl/discussions)
 - **Contributing**: See [CONTRIBUTING.md](../CONTRIBUTING.md)
 
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