Changes.old: Fix to 3.68 changelog

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Changes.old: tfix in 3.68 changelog

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
locale.5: Document glibc conventions regarding days and week

Based on existing practice and glibc community wiki page at
https://sourceware.org/glibc/wiki/Locales

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
locale.5: srcfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
locale.5: Drop a garbled sentence

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
locale.5: ffix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>