Missing channel name for Circuit Break Info stream API

[AkiraMiyakoda]

You recently added the descriptions about the Circuit Break Info at #102.
However, the channel name of the newly added API is missing from public-stream.md and public-stream_JP.md.

We can infer it from the response format, but it's better to make it clear.

[soichirokodama]

Thank you for pointing this out.
We will consider fixing the Docs.