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: #32156
Refs: #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>

doc/api/os.md

@@ -399,7 +399,7 @@ added: v13.11.0
 Returns a string identifying the kernel version.
 
 On POSIX systems, the operating system release is determined by calling
-[uname(3)][]. On Windows, `pRtlGetVersion` is used, and if it is not available,
+[uname(3)][]. On Windows, `RtlGetVersion()` is used, and if it is not available,
 `GetVersionExW()` will be used. See
 https://en.wikipedia.org/wiki/Uname#Examples for more information.