replay: update help text with route and service list details (#34743)

improve help

tools/replay/README.md

@@ -58,8 +58,8 @@ Mock openpilot components by publishing logged messages.
 
 Options:
   -h, --help             Displays this help.
-  -a, --allow <allow>    whitelist of services to send
+  -a, --allow <allow>    whitelist of services to send (comma-separated)
-  -b, --block <block>    blacklist of services to send
+  -b, --block <block>    blacklist of services to send (comma-separated)
   -c, --cache <n>        cache <n> segments in memory. default is 5
   -s, --start <seconds>  start from <seconds>
   -x <speed>             playback <speed>. between 0.2 - 3

tools/replay/main.cc

@@ -11,10 +11,10 @@
 #include "tools/replay/util.h"
 
 const std::string helpText =
-R"(Usage: replay [options]
+R"(Usage: replay [options] [route]
 Options:
-  -a, --allow        Whitelist of services to send
+  -a, --allow        Whitelist of services to send (comma-separated)
-  -b, --block        Blacklist of services to send
+  -b, --block        Blacklist of services to send (comma-separated)
   -c, --cache        Cache <n> segments in memory. Default is 5
   -s, --start        Start from <seconds>
   -x, --playback     Playback <speed>