fs: Document return values to VFS API calls
The commit adds missing documentation for various retrun values of
VFS API calls.
Signed-off-by: 
Dominik Ermel <dominik.ermel@nordicsemi.no>
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The commit adds missing documentation for various retrun values of
VFS API calls.
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>