Fixed #20756 -- Typo in uWSGI docs.
Couple of cleanups in RelatedObjectLookups.js

Thanks George Karpenkov.
Allowed Context.push to behave as a context mananger.

Thanks Loic Bistuer for the review.
Fixed #20625 -- Chainable Manager/QuerySet methods.

Thanks akaariai for the initial patch and charettes, mjtamlyn and timgraham
for the reviews.