Add MCP security ref docs (#4532)

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

spring-ai-docs/src/main/antora/modules/ROOT/nav.adoc

@@ -87,6 +87,7 @@
 **** xref:api/mcp/mcp-streamable-http-server-boot-starter-docs.adoc[Streamable-HTTP MCP Servers]
 **** xref:api/mcp/mcp-stateless-server-boot-starter-docs.adoc[Stateless Streamable-HTTP MCP Servers]
 // *** xref:api/mcp/mcp-helpers.adoc[MCP Utilities]
+*** xref:api/mcp/mcp-security.adoc[MCP Security (WIP)]
 *** xref:api/mcp/mcp-annotations-overview.adoc[MCP Annotations]
 **** xref:api/mcp/mcp-annotations-client.adoc[Client Annotations]
 **** xref:api/mcp/mcp-annotations-server.adoc[Server Annotations]