@untitaker really not sure what to do here. Maybe there's a way to indicate the package as well as the version for externals we're re-documenting? Or disable the versions in those cases? This came up while looking at #1704.

We should set a manual description for this function, and refer to Werkzeug docs (see intersphinx for that).

Another reason for a necessary rephrasing is that "return a WSGI application" is unnecessarily low-level for Flask's docs, and only appropriate for Werkzeug's.

Similar to how I wrote a plugin to collapse old version directives, maybe we can write a plugin that adds "Werkzeug version ...". That would be a lot more maintainable.

I apologize if this is more general, but what level of technical detail is desired when writing Flask docs? I wouldn't consider mentioning WSGI to be low-level, but can understand if that's meant to be abstracted.

I don't have a particular problem with how the API docs read currently. If we need to simplify something that can be done at a later time.