add intro to guides section

Author: mneedham

docs/use-cases/AI_ML/MCP/index.md

@@ -47,5 +47,7 @@ The [ClickHouse MCP Server](https://github.com/ClickHouse/mcp-clickhouse) offers
 
 ## Guides for using the ClickHouse MCP Server {#clickhouse-mcp-server-guides}
 
+Below are some guides showing how to use the ClickHouse MCP Server.
+
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