Doc: copy-edit the introductory para for the pg_class catalog.

The previous wording had a faint archaic whiff to it, and more
importantly used "catalogs" as a verb, which while cutely
self-referential seems likely to provoke confusion in this
particular context.  Also consistently use "kind" not "type" to
refer to the different kinds of relations distinguished by relkind.

Per gripe from Martin Nash.  Back-patch to supported versions.

Discussion: https://postgr.es/m/169518739902.3727338.4793815593763320945@wrigleys.postgresql.org

diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index aaf8361ac8aae780e4bfbb15e48577410e0bd7ad..6558c19554de6e0ac25ec36ea4ad4044b047c65c 100644 (file)
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -1834,15 +1834,15 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
   </indexterm>
 
   <para>
-   The catalog <structname>pg_class</structname> catalogs tables and most
-   everything else that has columns or is otherwise similar to a
+   The catalog <structname>pg_class</structname> describes tables and
+   other objects that have columns or are otherwise similar to a
    table.  This includes indexes (but see also
    <structname>pg_index</structname>), sequences (but see also
    <structname>pg_sequence</structname>), views, materialized
    views, composite types, and TOAST tables; see <structfield>relkind</structfield>.
-   Below, when we mean all of these
-   kinds of objects we speak of <quote>relations</quote>.  Not all
-   columns are meaningful for all relation types.
+   Below, when we mean all of these kinds of objects we speak of
+   <quote>relations</quote>.  Not all of <structname>pg_class</structname>'s
+   columns are meaningful for all relation kinds.
   </para>
 
   <table>