fix stale help message

when parsing command-line options, the -f option support disabling
8 scan and join methods, o, b and t disable index-only scans,
bitmap index scans, and TID scans respectively, add them to the
help message.

diff --git a/src/backend/main/main.c b/src/backend/main/main.c
index 5a964a0db6..f5da4260a1 100644
--- a/src/backend/main/main.c
+++ b/src/backend/main/main.c
@@ -351,7 +351,7 @@ help(const char *progname)
printf(_(" -?, --help show this help, then exit\n"));

printf(_("\nDeveloper options:\n"));
- printf(_(" -f s|i|n|m|h forbid use of some plan
types\n"));
+ printf(_(" -f s|i|o|b|t|n|m|h forbid use of some plan
types\n"));
printf(_(" -n do not reinitialize shared
memory after abnormal exit\n"));
printf(_(" -O allow system table structure
changes\n"));
printf(_(" -P disable system indexes\n"));

--
Regards
Junwang Zhao