Revert Android log limits to shared component and fix iOS max log length

[nelsitoPuglisi]

Summary

• Android pages: revert inline log limits back to using shared/log-limit.md, since the effective max message length is 4,000 for all platforms via remote config (app-service always returns LOG_MAX_LENGTH_MAX_VALUE = 4000)
• iOS 6x logs: fix incorrect "10,000 bytes" to "4,000 characters"
• shared/log-limit.md already had the correct value (4,000)

Supersedes #730 (closed due to messy commit history).
Reverts the Android-specific inlining from #727.

Test plan

• Verify Android log-message-api pages render the shared log-limit warning correctly
• Verify iOS 6x logs page shows "4,000 characters" instead of "10,000 bytes"
• Confirm shared/log-limit.md consumers (Flutter, RN, Unity, iOS 5x) still work

🤖 Generated with Claude Code

[github-actions]

Summary - Link Checker

Status	Count
🔍 Total	478
✅ Successful	382
⏳ Timeouts	0
🔀 Redirected	1
👻 Excluded	95
❓ Unknown	0
🚫 Errors	0
⛔ Unsupported	0

Redirects per input

Redirects in docs/data-destinations/honeycomb.md

• [200] https://docs.honeycomb.io/working-with-your-data/settings/api-keys/ | Redirect: Followed 2 redirects resolving to the final status of: OK. Redirects: https://docs.honeycomb.io/working-with-your-data/settings/api-keys/ --> https://docs.honeycomb.io/working-with-your-data/settings/api-keys --> https://docs.honeycomb.io/configure/environments/manage-api-keys
  Full Github Actions output

[github-actions]

Summary - Markdown Lint

Success: No issues found in 393 files (122ms)

[bidetofevil]

LGTM