tools: moveconfig: remove document about deprecated error message

Since commit cc008299f852 ("tools: moveconfig: do not rely on type
and default value given by users"), we do not have this error case.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
1 file changed