kernel: Documentation-Update for WideCharToMultiByte

[Detlef Riekenberg]

MSDN and our Documentation told us, that WC2MB returns on Success:
* If dstlen > 0, the number of characters written to dst.
* ... the count includes the terminating NUL

This is only valid, when the destination buffer is large enough to
receive the Result with the terminating NUL

When the destination buffer is to small, WC2MB returns '0' and
GetLastError() returns ERROR_INSUFFICIENT_BUFFER.


The Testsuite was updated to verify this.
The attached Patch updates the documentation.


Changelog:
- kernel: Documentation-Update for WideCharToMultiByte



-- 
By By ...
      ... Detlef
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