doc: -help-debug implies -help

I don't understand why `-help-debug` would be useful without requesting
the help, and I've made this particular mistake one time too many.

(ok, so apparently the original reason that -help-debug is an option is
to show debug options in the GUI option overview? that seems very
unlikely to ever be used, if someone wants to add a way to show debug
options in the GUI it'd be better to have a check box)

src/init.cpp

@@ -443,7 +443,7 @@ void SetupServerArgs()
     gArgs.AddArg("-debug=<category>", "Output debugging information (default: -nodebug, supplying <category> is optional). "
         "If <category> is not supplied or if <category> = 1, output all debugging information. <category> can be: " + ListLogCategories() + ".", false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-debugexclude=<category>", strprintf("Exclude debugging information for a category. Can be used in conjunction with -debug=1 to output debug logs for all categories except one or more specified categories."), false, OptionsCategory::DEBUG_TEST);
-    gArgs.AddArg("-help-debug", "Show all debugging options (usage: --help -help-debug)", false, OptionsCategory::DEBUG_TEST);
+    gArgs.AddArg("-help-debug", "Print help message with debugging options and exit", false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-logips", strprintf("Include IP addresses in debug output (default: %u)", DEFAULT_LOGIPS), false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-logtimestamps", strprintf("Prepend debug output with timestamp (default: %u)", DEFAULT_LOGTIMESTAMPS), false, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-logtimemicros", strprintf("Add microsecond precision to debug timestamps (default: %u)", DEFAULT_LOGTIMEMICROS), true, OptionsCategory::DEBUG_TEST);

src/qt/paymentrequestplus.cpp

@@ -142,7 +142,6 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
         if (result != 1) {
             int error = X509_STORE_CTX_get_error(store_ctx);
             // For testing payment requests, we allow self signed root certs!
-            // This option is just shown in the UI options, if -help-debug is enabled.
             if (!(error == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT && gArgs.GetBoolArg("-allowselfsignedrootcertificates", DEFAULT_SELFSIGNED_ROOTCERTS))) {
                 throw SSLVerifyError(X509_verify_cert_error_string(error));
             } else {

src/util.cpp

@@ -660,7 +660,7 @@ std::string ArgsManager::GetHelpMessage() const
 
 bool HelpRequested(const ArgsManager& args)
 {
-    return args.IsArgSet("-?") || args.IsArgSet("-h") || args.IsArgSet("-help");
+    return args.IsArgSet("-?") || args.IsArgSet("-h") || args.IsArgSet("-help") || args.IsArgSet("-help-debug");
 }
 
 static const int screenWidth = 79;