Outdated documentation of SharedDataMiddleware

[magula]

It seems that SharedDataMiddleware was moved to middleware.shared_data, but its documentation still says

    """A WSGI middleware that provides static content for development
    environments or simple server setups. Usage is quite simple::
        import os
        from werkzeug.wsgi import SharedDataMiddleware
[...]
    """

and the tutorial still says
from werkzeug.wsgi import SharedDataMiddleware.

[davidism]

I'm happy to consider a PR against the 1.0.x branch that address these docs.

[magula]

Splendid, I've created a pull request, see #1736.