[3.13] gh-129567: Add a note to `typing.TypedDict` docs about name mangling (GH-130233) (#130841)

gh-129567: Add a note to `typing.TypedDict` docs about name mangling (GH-130233)
(cherry picked from commit 63ffb406bb000a42b0dbddcfc01cb98a12f8f76a)

Co-authored-by: sobolevn <mail@sobolevn.me>