fix(library): restore the Slack-to-CRM cross-link

Author: waleedlatif1

apps/sim/content/library/best-ai-agents-sales-crm-automation/index.mdx

@@ -281,5 +281,6 @@ Sim’s related guides separate sales automation intent from broader AI-agent an
 
 - For the market-wide head term, use the canonical AI agent platforms and builders guide linked above.
 - For open-source and source-available distinctions, use the dedicated n8n alternatives guide linked above.
+- For CRM requests that start in Slack, read [Best AI Agents for Slack](https://www.sim.ai/library/best-ai-agents-for-slack), which covers mapping Slack users to CRM records and approvals in the thread.
 - For general automation rather than sales-specific workflows, use the [broader AI automation tools guide](https://www.sim.ai/library/best-ai-automation-tools-2026).
 - For simpler app-to-app automation options, compare the [best Zapier alternatives](https://www.sim.ai/library/best-zapier-alternatives).