Context Navigation

Changes between Initial Version and Version 1 of Ticket #15059, comment 7

initial	v1
5	5	I've added some context variables for actions.html. Basically, gone through the variables that are being used in django's implementation of actions.html and tried to document them. I'm not sure if the format is as expected though.
6	6
7		If this is the way we want the document to be, I'd be happy to add the documentation for the rest of the admin templates as well.
	7	If this is the way we want the document to be, I'd be happy to add the documentation for the rest of the admin templates as well.
	8
	9	https://github.com/django/django/pull/16096