Enhance MCP allowlist enforcement limitations details

Updated the limitations section to include description and version matching for MCP allowlist enforcement. This is as per the current validation in the VS Code.

Author: manupk

content/copilot/reference/mcp-allowlist-enforcement.md

@@ -12,7 +12,7 @@ contentType: reference
 
 MCP allowlist enforcement currently has the following limitations:
 
-* Enforcement is based only on server name/ID matching, which can be bypassed by editing configuration files
+* Enforcement is based only on server name/ID, description and version matching, which can be bypassed by editing configuration files
 * Strict enforcement that prevents installation of non-registry servers is not yet available
 
 For the highest level of security, you can **disable MCP servers in {% data variables.product.prodname_copilot_short %}** until strict enforcement is available.