Fix ECO template compilation errors

This type of escape character compilation errors exists on MACOS only, not author's Docker ubuntu dev, even though both platforms equipped with all the same library versions.

src/js/apps/lab/apiBrowser/tpl/api_method_page.jst.eco

@@ -8,7 +8,7 @@
 <% if @type is 'method': %>
     <div class="api-method--execute">
         <h3>Execute <strong><%= @method %></strong> with these params:</h3>
-            <textarea class="api-method--params" placeholder="Eg. [arg, foo, true]"></textarea>
+            <textarea class="api-method--params" placeholder="Eg. [<%= '\"' %>arg<%= '\"' %>, <%= '\"' %>foo<%= '\"' %>, true]"></textarea>
             <p class="description">Parameters get parsed by
                 <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse" target="_blank">JSON.parse</a>.
                 Check the console for response objects, you will get an 'unexpected token' error if parsing failed.