Add reauthentication instructions for MCP Client

Added instructions for forcing MCP Client reauthentication and managing OAuth sessions.

Author: kennyj42

src/content/docs/cloudflare-one/applications/configure-apps/mcp-servers/mcp-portals.mdx

@@ -148,6 +148,10 @@ For MCP clients with server configuration files, we recommend the following conf
 
 It is recommended that "mcp-remote@latest" is used. Using "serverURL" may cause issues with the portal session creation and management.
 
+If you want to force your MCP Client to reauthenticate, most MCP clients will refresh a session after removing the existing MCP OAuth sessions. Recommended command:
+
+`rm -rf ~/.mcp-auth`
+
 ## View portal logs
 
 Portal logs allow you to monitor user activity through an MCP server portal. You can view logs on a per-portal or per-server basis.