Update Plone docs for WSGI and Plone 5.2

[pbauer]

https://github.com/plone/documentation/blob/5.2/manage/upgrading/version_specific_migration/upgrade_to_52.rst needs a detailed section about the changes (or probably better: a link to a new page that has all this information).

Also there are sections in the docs where WSGI and ZServer is already mentioned and these need to be updated. E.g.: https://docs.plone.org/manage/deploying/performance/tips.html#zserver-thread-count https://docs.plone.org/manage/deploying/wsgi.html https://docs.plone.org/manage/deploying/stack.html

[dataflake]

FWIW and maybe it helps you guys, I've done some local testing and put together a WSGI information page for the Zope documentation at https://zope.readthedocs.io/en/latest/wsgi.html

[Rudd-O]

@dataflake that page is 404.

[pbauer]

https://zope.readthedocs.io/en/latest/ has plenty of info on wsgi. A server not yet mentioned there is pyruvate

[Rudd-O]

Thanks, P!