doc: document switchover from measured bytes to chars after setEncoding
Checklist
Ref: https://github.com/nodejs/node/issues/6798
This is documentation PR to denote the change of measurement against the highWaterMark in non-object streams after .setEncoding()
is called. It changes from bytes to character.
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documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc