write_file: add format attribute

This gives us compile-time checking of our format strings,
which is a good thing.

I had also hoped it would help with confusing write_file()
and write_file_buf(), since the former's "..." can make it
match the signature of the latter. But given that the buffer
for write_file_buf() is generally not a string literal, the
compiler won't complain unless -Wformat-nonliteral is on,
and that creates a ton of false positives elsewhere in the
code base.

While we're there, let's also give the function a docstring,
which it never had.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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