bug#57499: Documentation bug in the docstring of set-face-attribute?

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

>> >
>> > Warning: nil value for `%s' is invalid, use 'unspecified instead.
>> >
>> 
>> I added the name of the face in the message, which is I think useful to 
>> locate the cause of the warning.
>
> Thanks, SGTM.

Shouldn't the message say `unspecified' instead of 'unspecified?

'unspecified reads to (quote unspecified), and a list of `quote' and
`unspecified' is definitely not the right thing.