pgsql: doc: Clean up pg_recvlogical reference page

doc: Clean up pg_recvlogical reference page

This needed a general cleanup of wording, typos, outdated terminology,
formatting, and hard-to-understand and borderline incorrect information.

Also tweak the pg_receivexlog page a bit to make the two more
consistent.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/52c1ae22d6a4daf1c1c01fc9244f8ebae5402b1a

Modified Files
--------------
doc/src/sgml/ref/pg_receivexlog.sgml | 103 +++++------
doc/src/sgml/ref/pg_recvlogical.sgml | 338 +++++++++++++++++++---------------
2 files changed, 231 insertions(+), 210 deletions(-)

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