The value of core.worktree in a ".git/config" is honored even when it
differs from the directory that has the ".git" directory as its
subdirectory. This is likely to be a misconfiguration, so warn users
about it. Also, drop the part of the documentation that incorrectly
claimed that we ignore such a misconfigured value.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>