Replace localhost with SITE_ROOT variable in API example

templates/front/snippets/create_check_request.html

@@ -1,4 +1,4 @@
-<div class="highlight"><pre><span></span>curl http://localhost:8000/api/v1/checks/ <span class="se">\</span>
+<div class="highlight"><pre><span></span>curl {{ SITE_ROOT }}/api/v1/checks/ <span class="se">\</span>
     -X POST <span class="se">\</span>
     -d <span class="s1">&#39;{&quot;api_key&quot;: &quot;your-api-key&quot;, &quot;name&quot;: &quot;Backups&quot;, &quot;tags&quot;: &quot;prod www&quot;, &quot;timeout&quot;: 3600, &quot;grace&quot;: 60}&#39;</span>
 </pre></div>

templates/front/snippets/create_check_request.txt

@@ -1,3 +1,3 @@
-curl http://localhost:8000/api/v1/checks/ \
+curl SITE_ROOT/api/v1/checks/ \
     -X POST \
     -d '{"api_key": "your-api-key", "name": "Backups", "tags": "prod www", "timeout": 3600, "grace": 60}'