add release date to v3.0.2 whatsnew (#4160)

Author: bjlittle

docs/iris/src/whatsnew/3.0.2.rst

@@ -1,7 +1,7 @@
 .. include:: ../common_links.inc
 
-v3.0.2 (unreleased)
-*******************
+v3.0.2 (27 May 2021)
+********************
 
 This document explains the changes made to Iris for this release
 (:doc:`View all changes <index>`.)
@@ -48,14 +48,13 @@ This document explains the changes made to Iris for this release
       developers to easily disable `cirrus-ci`_ tasks. See
       :ref:`skipping Cirrus-CI tasks`. (:pull:`4019`) [``pre-v3.1.0``]
 
-   #. `@pp-mo`_ adjusted the use of :func:`dask.array.from_array` in :func:`iris._lazy_data.as_lazy_data`, to avoid
-      the dask 'test access'.  This makes loading of netcdf files with a large number of variables significantly faster.
-      (:pull:`4135`)
+   #. `@pp-mo`_ adjusted the use of :func:`dask.array.from_array` in :func:`iris._lazy_data.as_lazy_data`,
+      to avoid the dask 'test access'. This makes loading of netcdf files with a
+      large number of variables significantly faster. (:pull:`4135`)
 
    #. `@pp-mo`_ reverted a change made previously in (:pull:`3659`) to
-      PPDataProxy.__getitem__. The check for empty slicings is no longer needed
-      since (:pull:`4135`) was added.
-      (:pull:`4141`)
+      :meth:`iris.fileformats.pp.PPDataProxy.__getitem__`. The check for empty slicings
+      is no longer needed since (:pull:`4135`) was added. (:pull:`4141`)
 
    Note that, the above contributions labelled with ``pre-v3.1.0`` are part of the forthcoming
    Iris v3.1.0 release, but require to be included in this patch release.