[LTP] [PATCH v4 5/5] Adopt doc for TST_RETRY_FUNC for LTP_TIMEOUT_MUL

[Petr Vorel]

> Hi!
> > I think the function tst_multiply_timeout also needs documenting.

> That depends on if we want to export it or not.

> We may as well keep it in API and create a helper under testcases/lib/
> tehn we could use the C code that can multiply precisely in the shell as
> well. But I do not care that much either way...
+1. I wouldn't export it unless it's needed.

Kind regards,
Petr