Doc: improve PREPARE documentation, cross-referencing to plan_cache_mode.
The behavior described in the PREPARE man page applies only for the
default plan_cache_mode setting, so explain that properly. Rewrite
some of the text while I'm here. Per suggestion from Bruce.
Discussion: https://postgr.es/m/20190930155505.GA21095@momjian.us
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/ce734aaec1891ca2180c269b4c9adbfb13ca4052
Modified Files
--------------
doc/src/sgml/config.sgml | 30 ++++++++++-----------
doc/src/sgml/ref/prepare.sgml | 63 ++++++++++++++++++++++++-------------------
2 files changed, 50 insertions(+), 43 deletions(-)