[Toybox] [PATCH] ln.c: add -t to synopsis.

[enh]

We're inconsistent about whether the option help below should be just `-t`
or `-t DIR`, but the majority of commands _don't_ repeat their argument,
so I've left that as-is for now.
---
 toys/posix/ln.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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