Document ansible_managed changing the template.

docsite/rst/intro_configuration.rst

@@ -90,6 +90,8 @@ The default configuration shows who modified a file and when::
 
 This is useful to tell users that a file has been placed by Ansible and manual changes are likely to be overwritten.
 
+Note that if using this feature, and there is a date in the string, the template will be reported changed each time as the date is updated.
+
 .. _ask_pass:
 
 ask_pass

library/files/template

@@ -16,7 +16,9 @@ description:
        template file and the owner uid, C(template_host) contains the node name of 
        the template's machine, C(template_uid) the owner, C(template_path) the
        absolute path of the template, C(template_fullpath) is the absolute path of the 
-       template, and C(template_run_date) is the date that the template was rendered."
+       template, and C(template_run_date) is the date that the template was rendered. Note that including
+       a string that uses a date in the template will resort in the template being marked 'changed'
+       each time."
 options:
   src:
     description: