add beta partial to mcp docs (#1069)

This PR adds the beta partial to the Terraform MCP server docs and
renders it on the index page.

Author: trujillo-adam

content/terraform-mcp-server/v0.3.x/docs/mcp-server/index.mdx

@@ -7,6 +7,8 @@ description: Learn about the Terraform model context protocol (MCP) server and h
 
 The Terraform Model Context Protocol (MCP) server enhances AI models with real-time access to current Terraform provider documentation, modules, and policies from the [Terraform registry](https://registry.terraform.io). This ensures AI-generated Terraform configurations use accurate, up-to-date information rather than potentially outdated training data.
 
+@include 'beta.mdx'
+
 ## What is the Terraform MCP server?
 
 The Model Context Protocol (MCP) is an open standard that enables AI models to securely connect with external tools, applications, and data sources. MCP allows AI models to access information beyond their training data, providing more current and accurate responses.

content/terraform-mcp-server/v0.3.x/docs/partials/beta.mdx

@@ -0,0 +1,6 @@
+<!-- Use this partial for general beta callouts -->
+<Note>
+
+This feature is currently in beta. Do not use beta functionality in production environments.
+
+</Note>