doc: minor text fixes to streams.md
Refer to Node.js versions without a prepended `v`. This was standardized
on previously to avoid confusion between Node.js 8 and the V8 JavaScript
engine. (`Node.js 8` is clear. `v8` or even `Node.js v8`, not so much.)
It appears that a `to` was left out in one sentence of the streams.md
doc. Add it.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines