doc: avoid saying "inheritance" ...
... when it applies to partitioned relations. This is almost the
opposite of
0c06534bd63b, which removed references to "partition" in
favour of "child".
Author: Justin Pryzby <pryzby@telsasoft.com>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
Reviewed-by: Amit Langote <amitlangote09@gmail.com>
Discussion: https://postgr.es/m/
20220525013248.GO19626@telsasoft.com