docs(time): remove trailing comma in convert_time example response

[abhicris]

The example response object for the convert_time tool in src/time/README.md had a trailing comma after the last key ("time_difference").

  "time_difference": "+13.0h",
}

Trailing commas are not valid in standard JSON (RFC 8259 §2), so anyone copy-pasting the example into a strict JSON parser (e.g. json.loads in Python, JSON.parse in JS, a test fixture, or a schema validator) hits a parse error on what is documented as a valid response.

Why

Looking at the git history, the trailing comma was left over when a now-removed "date_changed": true field was deleted from the example. The comma after the preceding time_difference key was never cleaned up.

This makes the README example self-consistent with how the server actually serializes responses (via pydantic/json.dumps, which never emit trailing commas).

Scope

• Docs-only, no code touched
• 1-line change in src/time/README.md
• No new dependencies, no breaking changes
• Verified the block now parses with json.loads

Types of changes

• Documentation update

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Part of open-source blockchain work from kcolbchain.com - maintained by Abhishek Krishna.