Change the mention of "Inside the <script> part, the standard
output..." to use the definite article, which makes more sense in this
context.
This changes documentation I originally added back in commit
20873f45e7 ("t/README: Document the do's and don'ts of tests",
2010-07-02).
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>