updating MCP extension content

Author: mattchenderson

articles/azure-functions/TOC.yml

@@ -1010,11 +1010,11 @@
             - name: Output
               href: functions-bindings-kafka-output.md
               displayName: Kafka
-        - name: MCP tool
+        - name: MCP
           items:
             - name: Overview
               href: functions-bindings-mcp.md
-              displayName: MCP tool
+              displayName: MCP
             - name: Trigger
               href: functions-bindings-mcp-trigger.md
               displayName: MCP tool