Add alert for refreshing access when joining new Sentry organization

Co-authored-by: paul.jaffre <[email protected]>

Author: cursoragent

docs/product/sentry-mcp/index.mdx

@@ -59,6 +59,10 @@ Once authenticated, you'll see the tools become available in your MCP client.
 
 ![Available Sentry MCP Tools](./img/mcp-tools.png)
 
+<Alert>
+  If you've joined a new Sentry organization, log out of your LLM's MCP integration and log back in to refresh access.
+</Alert>
+
 ### Remote MCP Configuration (Legacy)
 
 For clients that don't support OAuth, you can continue using the existing Remote MCP endpoint configuration: