Follow-up: Consolidate node renderer probe settings docs

[justin808]

Follow-up from PR #3241: #3241

The review noted that probe values and curl flags are now documented in multiple places: the ERR_STREAM_PREMATURE_CLOSE mitigation steps, the Kubernetes sidecar manifest, and the JS configuration probe section. This is useful duplication for copy-paste examples, but it increases the chance of future drift.

Acceptance criteria:

• Audit the node-renderer probe settings in container-deployment.md and js-configuration.md.
• Decide which section should be canonical for timing values and curl command guidance.
• Keep copy-paste YAML examples usable while reducing repeated explanatory prose where practical.
• Ensure cross-references clearly point readers from summary guidance to the canonical examples.
• Run the relevant Markdown formatting/link checks.