restored incorrectly removed docs, jinja2 override

lib/ansible/modules/files/template.py

@@ -63,7 +63,13 @@ options:
     default: "yes"
 notes:
   - "Since Ansible version 0.9, templates are loaded with C(trim_blocks=True)."
-requirements: []
+  - "Also, you can override jinja2 settings by adding a special header to template file.
+    i.e. C(#jinja2:variable_start_string:'[%' , variable_end_string:'%]', trim_blocks: False)
+    which changes the variable interpolation markers to  [% var %] instead of  {{ var }}.
+    This is the best way to prevent evaluation of things that look like, but should not be Jinja2.
+    raw/endraw in Jinja2 will not work as you expect because templates in Ansible are recursively evaluated."
+
+
 author:
     - Ansible Core Team 
     - Michael DeHaan