docs: remove redundant namespace from HTTPRoute, Ingress, and ApisixRoute examples in configure-routes.md

[fengqi-dev]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

This pull request makes minor updates to the documentation in docs/en/latest/getting-started/configure-routes.md by removing the namespace: ingress-apisix field from several Kubernetes resource examples.

apisix-ingress-controller/examples/httpbin/deployment.yaml

Lines 60 to 63 in 878e501

	apiVersion: v1
	kind: Service
	metadata:
	name: httpbin

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[Copilot]

Pull request overview

This PR updates the getting-started routing documentation to avoid repeating the ingress-apisix namespace in example manifests, aligning the examples with the earlier prerequisite step that sets the kubectl context namespace.

Changes:

• Removed metadata.namespace: ingress-apisix from the HTTPRoute example.
• Removed metadata.namespace: ingress-apisix from the Ingress example.
• Removed metadata.namespace: ingress-apisix from the ApisixRoute example.

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