doc: fix os.version() Windows API

pRtlGetVersion is not a thing. This text was likely a result of
copying the variable name used in libuv. This commit updates the
documentation to reference the correct Windows API call.

PR-URL: https://github.com/nodejs/node/pull/32156
Refs: https://github.com/nodejs/node/pull/31732


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>