fix headers

Author: ddebrunner

ai/README.md

@@ -5,12 +5,12 @@
 Every API Connect for GraphQL deployed schema has an MCP `/mcp` endpoint
 in addition to its `/graphql` endpoint.
 
-Articles:
+### Articles
 
 - https://developer.ibm.com/articles/awb-simplifying-llm-integration-mcp-api-connect-graphql/
 - https://community.ibm.com/community/user/blogs/timil-titus/2025/10/12/mcp-and-ibm-api-connect-for-graphql
 
-Snippets:
+### Snippets
 
 - [Prescribed tools](../executable/prescribed/) - Demonstrates creation of MCP tools from persisted GraphQL operations.