Show more detail in nbtree rmgr descriptions.
Show a detailed description of the page offset number arrays that appear
in certain nbtree WAL records.
Also brings nbtree desc routines in line with the guidelines established
by recent commit
7d8219a4.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-By: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/flat/
20230109215842.fktuhesvayno6o4g%40awork3.anarazel.de