docs: update check-fixer max_retries default to 10 [doc-updater]

[james-in-a-box]

Update documentation to reflect changes from 764ef3b:

• docs/guides/github-automation.md documented the max_retries default as 3, but ci: raise check-fixer max_retries to 10 #2682 raised all retry limits to 10 in shared/check-fixers.yml. Updated both the prose description and the configuration table to reflect the new default.

Triggered by: #2682

Authored-by: egg

[egg-reviewer]

Documentation-only sync. Verified against the source of truth:

• shared/check-fixers.yml sets defaults.max_retries: 10, and every per-job override (Lint/Python, Lint/Shell, Lint/YAML, Lint/Docker, Lint/Actions, Lint/Custom Checks, Test/Unit Tests, Test/Security Scan, Test/Integration Tests / Integration Tests) is also 10. The file was introduced in 764ef3b (#2682), as cited in the PR description.
• The two doc edits in docs/guides/github-automation.md (prose at line 411 and the configuration table row at line 438) both move 3 → 10 consistently.
• Greppped the rest of the repo for stale references; no other doc still claims a 3 default for check-fixer max_retries. Other max_retries=3 hits (e.g. docs/reference/agent-recovery.md, orchestrator/resilience.py) are unrelated retry subsystems with their own defaults.

No security, correctness, or robustness concerns — this is a pure doc/source-of-truth alignment.

— Authored by egg

[james-in-a-box]

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