fix radio button selection, add documentation for field

data/web/index.html

@@ -124,7 +124,7 @@
   <script lang="text/javascript">
     var FORM_SETTINGS = [
       "admin_username", "admin_password", "ce_pin", "csn_pin", "reset_pin","packet_repeats",
-      "http_repeat_factor", "auto_restart_period","radio_interface_type"
+      "http_repeat_factor", "auto_restart_period", "radio_interface_type"
     ];
 
     var FORM_SETTINGS_HELP = {
@@ -134,7 +134,9 @@
         "requests initiated by the HTTP API. UDP API typically receives " +
         "duplicate packets, so more repeats should be used for HTTP.",
       auto_restart_period : "Automatically restart the device every number of " +
-        "minutes specified. Use 0 for disabled."
+        "minutes specified. Use 0 for disabled.",
+      radio_interface_type : "2.4 GHz radio model. Only change this if you know " +
+        "You're not using an NRF24L01!"
     }
 
     var UDP_PROTOCOL_VERSIONS = [ 5, 6 ];
@@ -244,8 +246,7 @@
 
           if (field.length > 0) {
             if (field.attr('type') === 'radio') {
-              console.log(field.filter('[value="' + val + '"]'));
-              field.filter('[value="' + val + '"]').attr('checked', 'checked');
+              field.filter('[value="' + val[k] + '"]').click();
             } else {
               field.val(val[k]);
             }
@@ -546,12 +547,15 @@
 
       FORM_SETTINGS.forEach(function(k) {
         var elmt = '<div class="form-entry">';
+        elmt += '<div>';
         elmt += '<label for="' + k + '">' + k + '</label>';
 
         if (FORM_SETTINGS_HELP[k]) {
           elmt += '<div class="field-help" data-help-text="' + FORM_SETTINGS_HELP[k] + '"></div>';
         }
 
+        elmt += '</div>';
+
         if(k === "radio_interface_type") {
           elmt += '<div class="btn-group" id="radio_interface_type" data-toggle="buttons">' +
             '<label class="btn btn-secondary active">' +