DOC: Copy edit 3.0 whatsnew

[rhshadrach]

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.
• If I used AI to develop this pull request, I prompted it to follow AGENTS.md.

[jorisvandenbossche]

Suggested change

	- Fixed bug in :meth:`Series.replace` and :meth:`DataFrame.replace` when trying to replace :class:`NA` values in a :class:`Float64Dtype` object with ``np.nan``; this now works with ``pd.set_option("mode.nan_is_na", False)`` and is irrelevant otherwise (:issue:`55127`)
	- Fixed bug in :meth:`Series.replace` and :meth:`DataFrame.replace` when trying to replace :class:`np.nan` values in a :class:`Int64Dtype` object with :class:`NA`; this is now a no-op with ``pd.set_option("mode.nan_is_na", False)`` and is irrelevant otherwise (:issue:`51237`)
	- Fixed bug in :meth:`Series.replace` and :meth:`DataFrame.replace` when trying to replace :class:`NA` values in a :class:`Float64Dtype` object with ``np.nan``; this now works with ``pd.set_option("future.distinguish_nan_and_na", True)`` and is irrelevant otherwise (:issue:`55127`)
	- Fixed bug in :meth:`Series.replace` and :meth:`DataFrame.replace` when trying to replace :class:`np.nan` values in a :class:`Int64Dtype` object with :class:`NA`; this is now a no-op with ``pd.set_option("future.distinguish_nan_and_na", True)`` and is irrelevant otherwise (:issue:`51237`)

That seems to have been an oversight in the renaming PR

[jorisvandenbossche]

The added reference pages give some failures to fix (or to add ignores for now)

[rhshadrach]

Thanks @jorisvandenbossche - should be good now. I fixed up the issues that existed but ignored anything due to the docstrings being incomplete.

[jorisvandenbossche]

Thanks!