toolhelp: Document InterruptRegister16

[Thomas Bleher]

The function is not implemented yet, but at least people reading the
  fixme:toolhelp:InterruptRegister16
message can more easily find out what they are missing out on.
---
 dlls/toolhelp.dll16/toolhelp.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

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