Make some more improvements to parallel query documentation.

Many places that mentioned only Gather should also mention Gather
Merge, or should be phrased in a more neutral way.  Be more clear
about the fact that max_parallel_workers_per_gather affects the number
of workers the planner may want to use.  Fix a typo.  Explain how
Gather Merge works.  Adjust wording around parallel scans to be a bit
more clear.  Adjust wording around parallel-restricted operations for
the fact that uncorrelated subplans are no longer restricted.

Patch by me, reviewed by Erik Rijkers




Modified Files
doc/src/sgml/config.sgml   |  4 +-
doc/src/sgml/parallel.sgml | 97 ++++++++++++++++++++++++++--------------------
2 files changed, 58 insertions(+), 43 deletions(-)

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