Add ECE+ECK diag troubleshooting video links

[stefnestor]

Summary

Links to ECE diagnostic-to-video and ECK diagnostic-to-video troubleshooting pages to Youtube walkthrough videos. (Same sentence formatting as Kibana diag, Elasticsearch diag, and Logstash diag pages.)

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

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🔍 Preview links for changed docs

• troubleshoot/deployments/cloud-enterprise/run-ece-diagnostics-tool.md
• troubleshoot/deployments/cloud-on-k8s/run-eck-diagnostics.md

[github-actions]

✅ Elastic Docs Style Checker (Vale)

No issues found on modified lines!

---

The Vale linter checks documentation changes against the Elastic Docs style guide. To use Vale locally or report issues, refer to Elastic style guide for Vale.

[github-actions]

Docs review summary

Reviewed both eligible changed files: troubleshoot/deployments/cloud-enterprise/run-ece-diagnostics-tool.md and troubleshoot/deployments/cloud-on-k8s/run-eck-diagnostics.md.

Focus areas

• Style and clarity: The added sentence ("Watch this video for a walkthrough of capturing an {{ece/eck}} diagnostic.") matches the exact wording pattern already used on the sibling Elasticsearch diagnostics page (troubleshoot/elasticsearch/diagnostic.md), so it's consistent with established convention. No clarity or style issues.
• Jargon: None introduced. {{ece}}/{{eck}} are already-established substitutions used throughout each page.
• Frontmatter and applies_to: Unchanged by this PR.
• Content type fit: No change to page structure or type; the added sentence fits naturally after the intro paragraph, consistent with the same placement pattern on sibling diagnostic pages.
• Parent issue satisfaction: Not applicable (no linked issue).

Notes

• The pre-fetched Vale finding (Elastic.MappedPages warning on line 3 of both files) refers to the pre-existing mapped_pages frontmatter key, which this PR does not modify — not applicable to this diff.

No actionable issues found. This is a clean, minimal, well-formed change.

Generated by Docs review agent for #7572 · sonnet50 24.5 AIC · ⌖ 6.39 AIC · ⊞ 15.6K · ◷

[yetanothertw]

LGTM, thanks, Stef! 🚀