core.autocrlf documentation: mention the crlf attribute
The description of the configuration variable is obsolete and
wrong (saying only file content is used), not just incomplete.
It has used the attribute mechanism for a long time.
The documentation of gitattributes mentions the core.autocrlf
configuration variable in its description of crlf attribute.
Refer to the gitattributes documentation from here as well.
Signed-off-by: Matthew Ogilvie <mmogilvi_git@miniinfo.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>