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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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/1ad56d595db6b57ff557d950f16bbe11260c7a1b

Modified Files
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doc/src/sgml/parallel.sgml | 52 +++++++++++++++++++++++-----------------------
1 file changed, 26 insertions(+), 26 deletions(-)

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