githooks.txt: minor improvements to the grammar & phrasing

Change:

 * Sentences that needed "the" or "a" to either add those or change them
   so they don't need them.

 * The little tangent about "You can use this to do X (if your project
   wants to do X)" can just be shortened to "if you want to do X".

 * s/parameter/parameters/ when the plural made more sense.

Most of this goes all the way back to the initial introduction of
hooks.txt in 6d35cc76 (Document hooks., 2005-09-02).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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