[LTP] [PATCH] doc/shell-test-api.txt: Don't include tst_test.sh twice

[Petr Vorel]

Hi Xu,

> Usually, we include tst_test.sh on the end of a case and on the
> top of tst_run. Some the beginning tst_test.sh is useless and remove.

Thanks a lot for fixing my error in 968bdc1 ("doc: Update shell API examples"), 
which was supposed to update doc to 04021637f ("tst_test.sh: Cleanup getopts usage").

I dared to slightly change your commit message and merged.

Kind regards,
Petr