docs: sync Polymarket docs - 2026-04-14

docs/api-reference/rate-limits.md

@@ -1,3 +1,7 @@
+> ## Documentation Index
+> Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
+> Use this file to discover all available pages before exploring further.
+
 # Rate Limits
 
 > API rate limits for all Polymarket endpoints
@@ -120,5 +124,3 @@ Trading endpoints have both **burst** limits (short spikes allowed) and **sustai
     Official TypeScript, Python, and Rust libraries.
   </Card>
 </CardGroup>
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