doc: improve bpchar and character type length details

Bruce Momjian <bruce@momjian.us>

Commit: b69db5173678223686e4669ab07d5ea907da2535
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-10-31T14:13:11Z
Releases: 17.0
doc:  improve bpchar and character type length details

Reported-by: Jeff Davis

Discussion: https://postgr.es/m/32a9b8357e8e29b04f395f92c53b64e015a4caf1.camel@j-davis.com

Author: Jeff Davis, adjustments by me

Backpatch-through: 16

Files

PathChange+/−
doc/src/sgml/datatype.sgml modified +17 −10

Documentation touched