NtCommitTransaction - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTTMAPI_H
#if (PHNT_VERSION >= PHNT_VISTA)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtCommitTransaction(
    _In_ HANDLE TransactionHandle,
    _In_ BOOLEAN Wait
    );

#endif
#endif

View code on GitHub
#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwCommitTransaction(
    _In_ HANDLE TransactionHandle,
    _In_ BOOLEAN Wait
    );

#endif

View code on GitHub

This function is documented in Windows Driver Kit here and here.

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