Add whatsnew entries

docs/iris/src/whatsnew/latest.rst

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+.. include:: ../common_links.inc
+
+<unreleased>
+************
+
+This document explains the changes made to Iris for this release
+(:doc:`View all changes <index>`.)
+
+
+📢 Announcements
+================
+
+* N/A
+
+
+✨ Features
+===========
+
+* N/A
+
+
+🐛 Bugs Fixed
+=============
+
+* `@znicholls`_ fixed :meth:`~iris.quickplot._title` to only check ``units.is_time_reference`` if the ``units`` symbol is not used. (:pull:`3902`)
+
+
+💣 Incompatible Changes
+=======================
+
+* N/A
+
+
+🔥 Deprecations
+===============
+
+* N/A
+
+
+🔗 Dependencies
+===============
+
+* N/A
+
+
+📚 Documentation
+================
+
+* N/A
+
+
+💼 Internal
+===========
+
+* `@znicholls`_ added a test for plotting with the label being taken from the unit's symbol, see :meth:`~iris.tests.test_quickplot.TestLabels.test_pcolormesh_str_symbol` (:pull:`3902`).
+
+* `@znicholls`_ made :func:`~iris.tests.idiff.step_over_diffs` robust to hyphens (``-``) in the input path (i.e. the ``result_dir`` argument) (:pull:`3902`).