doc: mention that intervening major releases can be skipped

Bruce Momjian <bruce@momjian.us>

Commit: 2bda93f813919b58225f5a0e282e10b98d7633d4
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-04-02T01:17:33Z
Releases: 14.0
doc:  mention that intervening major releases can be skipped

Also mention that you should read the intervening major releases notes.
This change was also applied to the website.

Discussion: https://postgr.es/m/20210330144949.GA8259@momjian.us

Backpatch-through: 9.6

Files

PathChange+/−
doc/src/sgml/runtime.sgml modified +3 −3

Documentation touched