docs: improve AT TIME ZONE description
authorBruce Momjian <bruce@momjian.us>
Wed, 5 Sep 2018 02:34:07 +0000 (22:34 -0400)
committerBruce Momjian <bruce@momjian.us>
Wed, 5 Sep 2018 02:34:07 +0000 (22:34 -0400)
commit20ce8739902dfef487664f0c310376bec34cd62d
tree902e1e32aba6e1236e21afecb760f1e35b351301
parent113020627235adbc934a5898cb74394c3ae44627
docs:  improve AT TIME ZONE description

The previous description was unclear.  Also add a third example, change
use of time zone acronyms to more verbose descriptions, and add a
mention that using 'time' with AT TIME ZONE uses the current time zone
rules.

Backpatch-through: 9.3
doc/src/sgml/func.sgml