Incorrect documentation in registry.d

[kbogert at kbogert.dyndns.org]

Hello all,

Please update the documentation in std/windows/registry.d

All of the setValue methods have a note attached that they throw
RegistryException if the value you are trying to set is not found.  This is not
what happens, if the value is not found the Reg_SetValueExA creates it.  It will
throw the exception if you don't have the security permissions to modify it.

kdb