Update saas-mcp.mdx (cloudflare#25505)

updating from sse to mcp for the endpoint

Author: kennyj42

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

@@ -187,12 +187,12 @@ To test in Workers AI Playground:
 
 1. Go to [Workers AI Playground](https://playground.ai.cloudflare.com/).
 
-2. Under **MCP Servers**, enter `https://mcp-server-cf-access.<YOUR_SUBDOMAIN>.workers.dev/sse`  for the MCP server URL.
+2. Under **MCP Servers**, enter `https://mcp-server-cf-access.<YOUR_SUBDOMAIN>.workers.dev/mcp`  for the MCP server URL.
 
 3. Select **Connect**.
 
 4. A popup window will appear requesting access to the MCP server. Select **Approve**.
 
 5. Follow the prompts to log in to your identity provider.
 
-Workers AI Playground will show a **Connected** status. The MCP server should successfully obtain an `access_token` from Cloudflare Access.
+Workers AI Playground will show a **Connected** status. The MCP server should successfully obtain an `access_token` from Cloudflare Access.