Wrong code highlighting in streamReadBytesUntil.adoc.

[SeppPenner]

https://github.com/arduino/reference-en/blob/master/Language/Functions/Communication/Stream/streamReadBytesUntil.adoc:

[SeppPenner]

Same for https://github.com/arduino/reference-en/blob/master/Language/Functions/Communication/Stream/streamReadBytes.adoc.

[SeppPenner]

Is contained in #559. See comment here, too: #581 (comment)