Clean up updating-configuration-via-a-configmap.md

[windsonsea]

Try to make it prettier in the editing mode:

• Add a blank line between paras
• Tweak long lines
• Replace four ` with three ` for a few code snippets

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[tengqm]

/lgtm
/approve
/kind cleanup

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4d111da7fdd2c5db2cc60b4761c3d67a46f94802

[k8s-ci-robot]

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