Document that is the psql version number, not the server version number,

that controls .psqlrc.

doc/src/sgml/ref/psql-ref.sgml

@@ -3332,8 +3332,8 @@ PSQL_EDITOR_LINENUMBER_ARG='--line '
      Both the system-wide <filename>psqlrc</filename> file and the user's
      <filename>~/.psqlrc</filename> file can be made version-specific
      by appending a dash and the <productname>PostgreSQL</productname>
-     major or minor release number, for example
-     <filename>~/.psqlrc-9.2</filename> or
+     major or minor <application>psql</application> release number,
+     for example <filename>~/.psqlrc-9.2</filename> or
      <filename>~/.psqlrc-9.2.5</filename>.  The most specific
      version-matching file will be read in preference to a
      non-version-specific file.