doc: Replace some uses of "which" by "that" in parallel.sgml

This makes the documentation more accurate grammatically.

Author: Elena Indrupskaya
Discussion: 
https://postgr.es/m/[email protected]
Backpatch-through: 9.6

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/163074ea84efec6ffa4813db43cc956ac5d12565

Modified Files
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doc/src/sgml/parallel.sgml | 54 +++++++++++++++++++++++-----------------------
1 file changed, 27 insertions(+), 27 deletions(-)

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