fix(sjm-config): update flow for K8s SJM configuration

[Aashirwadjain]

Description

This PR improves the clarity and steps, and adds details about how to scale out using fixed-capacity units for parallelism and completions per Helm deployment.

[github-actions]

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[Aashirwadjain]

netlify build

[github-actions]

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[Aashirwadjain]

netlify build

[tejaswaroop-nr]

Waiting for confirmation from @keegoid-nr on #help-documentation.

[adutta-newrelic]

The changes have been resolved in https://github.com/newrelic/docs-website/pull/22020/files