docs(subscriptions): fix client HTTP URL to point at /mcp endpoint

[jinghuan-Chen]

Motivation and Context

The Streamable HTTP instructions in examples/subscriptions/README.md pointed at the wrong endpoint. The example server (examples/subscriptions/server.ts) mounts the MCP handler at /mcp (app.all('/mcp', ...)), but the README instructed users to connect the client to http://127.0.0.1:3000/. Following the docs as written, the client would hit the root path instead of the MCP endpoint and the example would fail to connect.

How Has This Been Tested?

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

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commit: ad73860