fix: keep the troubleshooting snippet ASCII-only

`tests/test_examples.py` pipes every code block in `docs/troubleshooting.md`
through ruff, and on Windows that pipe is cp1252, not UTF-8: a `…` in the
snippet reached ruff as invalid UTF-8 and failed every Windows job. The
character carried no meaning the prose didn't already.

Author: himanshu-commits

docs/troubleshooting.md

@@ -179,7 +179,7 @@ async def list_tools() -> None:
         async with Client("https://mcp.example.com/mcp") as client:
             await client.list_tools()
     except MCPError as exc:
-        status = (exc.error.data or {}).get("httpStatus")  # 421 here; 401, 403, 503 … elsewhere
+        status = (exc.error.data or {}).get("httpStatus")  # 421 here; 401, 403, 503 elsewhere
         print(status)
 ```