Docs say ImmutableMultiDict is deprecated but typo obscures recommended replacement #3076
Description
The docs say "ImmutableMultiDict deprecated; use ImmutableMultiDict instead" (link):
This was introduced in PR #2975. There are several places (two at least? three?) in that PR that make this error; some in docs, some in docstrings.
The changed places that don't make this error recommend using MultiDict (and the original issue seems to say that as well, #2968 (comment)) so I assume that's the correct recommendation for all of these cases?