Minor improvements for psql help output.

Fix alphabetization of the output of "\?", and improve one description.

Update PageOutput counts where needed, fixing breakage from previous
patches.

Haiying Tang (PageOutput fixes by me)

Discussion: https://postgr.es/m/OS0PR01MB61136018064660F095CB57A8FB129@OS0PR01MB6113.jpnprd01.prod.outlook.com

src/bin/psql/help.c

@@ -166,7 +166,7 @@ slashUsage(unsigned short int pager)
 	 * Use "psql --help=commands | wc" to count correctly.  It's okay to count
 	 * the USE_READLINE line even in builds without that.
 	 */
-	output = PageOutput(135, pager ? &(pset.popt.topt) : NULL);
+	output = PageOutput(136, pager ? &(pset.popt.topt) : NULL);
 
 	fprintf(output, _("General\n"));
 	fprintf(output, _("  \\copyright             show PostgreSQL usage and distribution terms\n"));
@@ -236,8 +236,8 @@ slashUsage(unsigned short int pager)
 	fprintf(output, _("  \\dD[S+] [PATTERN]      list domains\n"));
 	fprintf(output, _("  \\ddp    [PATTERN]      list default privileges\n"));
 	fprintf(output, _("  \\dE[S+] [PATTERN]      list foreign tables\n"));
-	fprintf(output, _("  \\det[+] [PATTERN]      list foreign tables\n"));
 	fprintf(output, _("  \\des[+] [PATTERN]      list foreign servers\n"));
+	fprintf(output, _("  \\det[+] [PATTERN]      list foreign tables\n"));
 	fprintf(output, _("  \\deu[+] [PATTERN]      list user mappings\n"));
 	fprintf(output, _("  \\dew[+] [PATTERN]      list foreign-data wrappers\n"));
 	fprintf(output, _("  \\df[anptw][S+] [FUNCPTRN [TYPEPTRN ...]]\n"
@@ -257,7 +257,7 @@ slashUsage(unsigned short int pager)
 	fprintf(output, _("  \\dO[S+] [PATTERN]      list collations\n"));
 	fprintf(output, _("  \\dp     [PATTERN]      list table, view, and sequence access privileges\n"));
 	fprintf(output, _("  \\dP[itn+] [PATTERN]    list [only index/table] partitioned relations [n=nested]\n"));
-	fprintf(output, _("  \\drds [PATRN1 [PATRN2]] list per-database role settings\n"));
+	fprintf(output, _("  \\drds [ROLEPTRN [DBPTRN]] list per-database role settings\n"));
 	fprintf(output, _("  \\dRp[+] [PATTERN]      list replication publications\n"));
 	fprintf(output, _("  \\dRs[+] [PATTERN]      list replication subscriptions\n"));
 	fprintf(output, _("  \\ds[S+] [PATTERN]      list sequences\n"));
@@ -344,10 +344,10 @@ helpVariables(unsigned short int pager)
 	/*
 	 * Keep this line count in sync with the number of lines printed below!
 	 * Use "psql --help=variables | wc" to count correctly; but notice that
-	 * Windows builds currently print one more line than non-Windows builds.
+	 * Windows builds currently print one fewer line than non-Windows builds.
 	 * Using the larger number is fine.
 	 */
-	output = PageOutput(160, pager ? &(pset.popt.topt) : NULL);
+	output = PageOutput(161, pager ? &(pset.popt.topt) : NULL);
 
 	fprintf(output, _("List of specially treated variables\n\n"));