Document per task remote_user, based on #3932

docsite/rst/playbooks.rst

@@ -103,6 +103,21 @@ documentation.  The `remote_user` is just the name of the user account::
 
     The `remote_user` parameter was formerly called just `user`. It was renamed in Ansible 1.4 to make it more distinguishable from the `user` module (used to create users on remote systems).
 
+Remote users can also be defined per task::
+
+    ---
+    - hosts: webservers
+      remote_user: root
+      tasks:
+        - name: test connection
+          ping:
+          remote_user: yourname
+
+.. Note::
+
+    The `remote_user` parameter for tasks was added in 1.4.
+
+
 Support for running things from sudo is also available::
 
     ---