Merge pull request #3343 from vespa-engine/hmusum/update-feed-tuning-doc

Add a note about restart required when tuning feeding parameters

en/reference/services-content.html

@@ -910,12 +910,13 @@ <h2 id="feeding">feeding</h2>
 <ul>
   <li id="feeding-concurrency"><code>concurrency</code>:
     A number between 0.0 and 1.0 that specifies the concurrency when handling feed operations, default 0.5.
-    When set to 1.0, all cores on the cpu can be used for feeding.
+    When set to 1.0, all cores on the cpu can be used for feeding. Changing this value requires restart of
+    node to take effect.
   </li>
   <li id="feeding-niceness"><code>niceness</code>:
     A number between 0.0 and 1.0 that specifies the niceness of the feeding threads, default 0.0 => not any nicer than anyone else.
     Increasing this number will reduce priority of feeding compared to search. The real world effect is hard to predict as the magic
-    exists in the OS level scheduler.
+    exists in the OS level scheduler. Changing this value requires restart of node to take effect.
   </li>
 </ul>
 <pre>{% highlight xml %}