GlobalUnlock return value seems weird

### Summary

It is translated to a result, but in both case GetLastError returns NO_ERROR so it seems a bit weird.

https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-globalunlock

### Crate manifest

_No response_

### Crate code

_No response_

The issue names GlobalUnlock and links its Microsoft documentation, but provides no crate code, file, or test. Start by comparing the documented API return semantics with the generated metadata and its handling of GetLastError. Done means the return-value behavior is confirmed and any required metadata correction has a regression check.

Written by the indexing model from the issue text.