Add before publish rules limits to Limits page

[ably-sync-bot]

Summary

• Adds a new "Before publish rules limits" section to the Limits documentation page
• Documents rate and concurrency limits for before publish rules, which use the same ConcurrencyRateLimit structure as reactor HTTP event limits
• Limit values match existing webhook/integration limits as these share the same underlying defaults

Resolves CHA-1252

Test plan

• Verify the new section renders correctly in the docs site
• Confirm limit values align with the realtime BeforePublishRuleLimits defaults
• Check cross-reference link to custom moderation docs works

🤖 Generated with Claude Code

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Submitted by: Steven Lindsay (steven.lindsay@ably.com)
Submitted at: 2026-04-13T09:44:15.117Z
Created via githubCreatePRWithFile MCP tool

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