Update mcp.mdx (#5771)

The original instruction doesn't tell users to enable experimental features in Jan first. Without it, the MCP Servers tab won't appear.

Author: bytrangle

docs/src/pages/docs/mcp.mdx

@@ -124,7 +124,7 @@ you will need to wait for a response). Efficient management of tools and their o
 
 To illustrate how MCPs can be used within Jan, we will walk through an example using the [Browser MCP](https://browsermcp.io/).
 
-Before we begin, you will need to enable Jan's MCP functionality at `Settings` > `MCP Servers`, and toggle
+Before we begin, you will need to enable experimental features at `General` > `Advanced`. Next, go to `Settings` > `MCP Servers`, and toggle
 the `Allow All MCP Tool Permission` switch ON.
 
 ![Turn on the MCP Host](./_assets/mcp-on.png)