Remove postgres --help blurb about the removed -A option.

I missed this in 3bdcf6a5a7.

Noticed by Merlin Moncure
Discussion: CAHyXU0yC7uPeeVzQROwtnrOP9dxTEUPYjB0og4qUnbipMEV57w@mail.gmail.com

src/backend/main/main.c

@@ -284,9 +284,6 @@ help(const char *progname)
 	printf(_("%s is the PostgreSQL server.\n\n"), progname);
 	printf(_("Usage:\n  %s [OPTION]...\n\n"), progname);
 	printf(_("Options:\n"));
-#ifdef USE_ASSERT_CHECKING
-	printf(_("  -A 1|0             enable/disable run-time assert checking\n"));
-#endif
 	printf(_("  -B NBUFFERS        number of shared buffers\n"));
 	printf(_("  -c NAME=VALUE      set run-time parameter\n"));
 	printf(_("  -C NAME            print value of run-time parameter, then exit\n"));