Add patch_namespaced_config_map example

[broken-dream]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Add example for patch_namespaced_config_map()

Which issue(s) this PR fixes:

Fixes #2299

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

• ✅login: broken-dream / (331848f)

The committers listed above are authorized under a signed CLA.

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[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: broken-dream, yliaog

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