fix(templating): minor fix to default property name, fixes #3378

docs/sources/reference/dashboard.md

 ----
-page_title: Dashboard JSON 
+page_title: Dashboard JSON
 page_description: Dashboard JSON Reference
 page_keywords: grafana, dashboard, json, documentation
 ---
@@ -363,7 +363,7 @@ Usage of the fields is explained below:
         ],
         "query": "tag_values(cpu.utilization.average,env)",
         "refresh": false,
-        "refresh_on_load": false,
+        "refresh": false,
         "type": "query"
       },
       {
@@ -390,7 +390,7 @@ Usage of the fields is explained below:
           }
         ],
         "query": "tag_values(cpu.utilization.average,app)",
-        "refresh_on_load": false,
+        "refresh": false,
         "regex": "",
         "type": "query"
       }
@@ -413,7 +413,7 @@ Usage of the above mentioned fields in the templating section is explained below
 | **name** | name of variable |
 | **options** | array of variable text/value pairs available for selection on dashboard |
 | **query** | datasource query used to fetch values for a variable |
-| **refresh_on_load** | TODO |
+| **refresh** | TODO |
 | **regex** | TODO |
 | **type** | type of variable, i.e. `custom`, `query` or `interval` |
 

public/app/features/templating/editorCtrl.js

@@ -12,7 +12,7 @@ function (angular, _) {
     var replacementDefaults = {
       type: 'query',
       datasource: null,
-      refresh_on_load: false,
+      refresh: false,
       name: '',
       options: [],
       includeAll: false,

public/dashboards/template_vars.json

@@ -241,7 +241,7 @@
       {
         "type": "query",
         "datasource": null,
-        "refresh_on_load": false,
+        "refresh": false,
         "name": "metric",
         "options": [],
         "includeAll": true,