docs(v0.6.0): fix broken links in observability snapshot page

[mesutoezdil]

docs/v0.6.0/observability.md carries the same broken links docs/user/observability.md had before #240: they pointed to old paths, the real pages live under metrics/. This is a frozen version snapshot, normally left alone per docs/AGENTS.md, but fixed here at explicit request since #240 does not touch it.

Tested: verified each new link target exists on disk.

Refs: NO-REF

Summary by CodeRabbit

• Documentation
  • Updated observability documentation links to match the latest Markdown file paths.
  • Corrected references for application statistics, service metrics, gRPC proxy metrics, example dashboards, and State Metrics Service metrics.

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between adfbbd8 and fc42594.

📒 Files selected for processing (1)

• docs/v0.6.0/observability.md

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📝 Walkthrough

Walkthrough

Updated observability documentation links to reference their new relative Markdown paths, including application statistics, service metrics, gRPC proxy metrics, example dashboards, and state metrics.

Changes

Observability documentation

Layer / File(s)	Summary
Update observability link paths docs/v0.6.0/observability.md	Updated links in the question table and application-level statistics section to use the new .md paths.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• NVIDIA/nvcf#240: Updates the same observability documentation links, including metrics and dashboard references.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: fixing broken documentation links in the observability page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[pdmack]

This PR is one of four that together fix the lychee link check failures currently blocking CI on other PRs (e.g. #252). Verified locally: with #240, #241, #242, and #261 all applied, lychee --offline and fern check both pass with zero errors.

Note: broader broken-link issues remain visible via fern check --broken-links (14 additional errors in nav-tree resolution, pre-existing and out of scope here).

@sbaum1994 -- can you review and approve so these can merge?