doc, http: add `rejectNonStandardBodyWrites` option, clear its behaviour
Document rejectNonStandardBodyWrites
option and its behaviour. Make the documentation clear that rejection only happens when rejectNonStandardBodyWrites
is set to true.
Fixes: https://github.com/nodejs/node/issues/53035 Refs: https://github.com/nodejs/node/pull/47732#discussion_r1199839025, https://github.com/nodejs/node/issues/47480