Doc: clarify wording about tool requirements in sourcerepo.sgml.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 3834abe90c7359319d1909fdb69a40963276a690
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-07-10T04:08:19Z
Releases: 10.0
Doc: clarify wording about tool requirements in sourcerepo.sgml.

Original wording had confusingly vague antecedent for "they", so replace
that with a more repetitive but clearer formulation.  In passing, make the
link to the installation requirements section more specific.  Per gripe
from Martin Mai, though this is not the fix he initially proposed.

Discussion: https://postgr.es/m/CAN_NWRu-cWuNaiXUjV3m4H-riWURuPW=j21bSaLADs6rjjzXgQ@mail.gmail.com

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