Fix description and documentation related to pg_restore --no-comments

These descriptions have been referring to object dump, but a restore
operation is done.

Reported-by: Andrey Lizenko
Author: Andrey Lizenko
Discussion: https://postgr.es/m/152992021588.1268.16786093506650391435@wrigleys.postgresql.org

doc/src/sgml/ref/pg_restore.sgml

@@ -579,7 +579,8 @@
       <term><option>--no-comments</option></term>
       <listitem>
        <para>
-        Do not dump comments.
+        Do not output commands to restore comments, even if the archive
+        contains them.
        </para>
       </listitem>
      </varlistentry>

src/bin/pg_dump/pg_restore.c

@@ -483,7 +483,7 @@ usage(const char *progname)
 	printf(_("  --disable-triggers           disable triggers during data-only restore\n"));
 	printf(_("  --enable-row-security        enable row security\n"));
 	printf(_("  --if-exists                  use IF EXISTS when dropping objects\n"));
-	printf(_("  --no-comments                do not dump comments\n"));
+	printf(_("  --no-comments                do not restore comments\n"));
 	printf(_("  --no-data-for-failed-tables  do not restore data of tables that could not be\n"
 			 "                               created\n"));
 	printf(_("  --no-publications            do not restore publications\n"));