[Toybox] [PATCH] date.c: add a few more important specifiers to --help.

[enh]

Odd (and un-toyboxy) that we advertise the locale-specific output
formats but not the ISO ones :-)
---
 toys/posix/date.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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