Fix follow_redirect/3 doc example for regular redirects

[preciz]

For :redirect the return tuple of follow_redirect is {:ok, conn}.
The 3 tuple is for :live_redirect.

So to match the previous line's logic this has to be the {:ok, conn}.

The function below that shows the correct return value:

phoenix_live_view/lib/phoenix_live_view/test/live_view_test.ex

Line 1862 in a7d9c36

{:error, {:redirect, opts}} ->