Document: sudo works per-task too

Document that you can use sudo at the task level as well

docsite/latest/rst/playbooks.rst

@@ -98,6 +98,16 @@ Support for running things from sudo is also available::
       user: yourname
       sudo: yes
 
+You can also use sudo on a particular task instead of the whole play::
+
+    ---
+    - hosts: webservers
+      user: yourname
+      tasks:
+        - service: name=nginx state=started
+          sudo: yes
+
+
 You can also login as you, and then sudo to different users than root::
 
     ---