whatsnew fixes

Author: jschendel

doc/source/whatsnew/v0.22.0.txt

@@ -88,7 +88,7 @@ Backwards incompatible API changes
 Dependencies have increased minimum versions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-We have updated our minimum supported versions of dependencies (:issue:`15184`, :issue:`18613`).
+We have updated our minimum supported versions of dependencies (:issue:`15184`).
 If installed, we now require:
 
    +-----------------+-----------------+----------+
@@ -98,8 +98,6 @@ If installed, we now require:
    +-----------------+-----------------+----------+
    | openpyxl        | 2.4.0           |          |
    +-----------------+-----------------+----------+
-   | Cython          | 0.24            |          |
-   +-----------------+-----------------+----------+
 
 
 .. _whatsnew_0220.api:
@@ -128,6 +126,7 @@ Other API Changes
 - :func:`Series.fillna` now raises a ``TypeError`` instead of a ``ValueError`` when passed a list, tuple or DataFrame as a ``value`` (:issue:`18293`)
 - :func:`pandas.DataFrame.merge` no longer casts a ``float`` column to ``object`` when merging on ``int`` and ``float`` columns (:issue:`16572`)
 - The default NA value for :class:`UInt64Index` has changed from 0 to ``NaN``, which impacts methods that mask with NA, such as ``UInt64Index.where()`` (:issue:`18398`)
+- Building pandas for development now requires ``cython >= 0.24`` (:issue:`18613`)
 
 .. _whatsnew_0220.deprecations: