doc: un-mark Socket#write “removal” as notable change

Since the method is inherited from `Writable`, usage of the method
does not change at all after its removal as an explicit method.

Calling it out as notable might therefore be more confusing than
helpful.

PR-URL: https://github.com/nodejs/node/pull/18083


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>