[3.0.x] Refs #28954 -- Remove remaining Jython documentation.

There is still no further progress on Jython 3 since support for Jython
was stripped in Django 2.0. The developers experimenting with Jython 3
have stated that they would need to start from scratch, so it doesn't
look as though it will materialize for years to come.

Python 2 and Django 1.11, the last version to support Python 2.7, will
both be end-of-life before Django 3.1 is released. We should no longer
instruct users to use an unsupported version of Django.

Backport of d8b6a76bc745b21c6cf2b29c220a91bcae7fd3d7 from master

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