docs(federation): add missing namespace on federation guide

[slonka]

We were missing a namespace and you get then:

Error from server (NotFound): error when creating "STDIN": namespaces "kuma-demo" not found

because we never created this NS on global (see guide up until the change).

Did you sign your commit? Instructions yes

Have you read Contributing guidelines? yes

[Copilot]

Pull Request Overview

This PR adds a missing namespace creation step to federation documentation guides. The change prevents users from encountering a "namespaces 'kuma-demo' not found" error when following the federation setup instructions.

• Adds instruction to create kuma-demo namespace on the global control plane before applying policies
• Ensures namespace exists before subsequent policy operations that reference it
• Maintains consistency across both federation guide variants

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
app/_src/guides/federate.md	Adds namespace creation step before policy application section
app/_src/guides/federate-kv.md	Adds namespace creation step before policy application section

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[Copilot]

Grammar issue: Missing article "the" before "demo application". The sentence should read "namespace of the demo application" for correct grammar.

Suggested change

	First we need to create a namespace on global control plane to match the namespace of demo application in zone control plane:
	First we need to create a namespace on global control plane to match the namespace of the demo application in zone control plane:

[Copilot]

Grammar issue: Missing article "the" before "demo application". The sentence should read "namespace of the demo application" for correct grammar.

Suggested change

	First we need to create a namespace on global control plane to match the namespace of demo application in zone control plane:
	First we need to create a namespace on global control plane to match the namespace of the demo application in zone control plane:

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