DOCS: Add whatsnew for recent PRs (SciTools#5789)

* add whatsnews for recent PRs

* Update docs/src/whatsnew/latest.rst

Co-authored-by: Bill Little <bill.little@metoffice.gov.uk>

---------

Co-authored-by: Bill Little <bill.little@metoffice.gov.uk>

docs/src/whatsnew/latest.rst

@@ -77,6 +77,12 @@ This document explains the changes made to Iris for this release
    requests are also labelled using the `Pull Request Labeler Github action`_
    to increase visibility. (:pull:`5763`, :pull:`5776`)
 
+#. `@tkknight`_ updated codebase to comply with a new enforced rule `NPY002`_ for
+   `ruff`_.  (:pull:`5786`)
+
+#. `@tkknight`_ enabled `numpydoc validation`_ via the pre-commit hook.  The docstrings
+   have been updated to comply and some rules have been ignored for now.
+   (:pull:`5762`)
 
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,
@@ -89,3 +95,5 @@ This document explains the changes made to Iris for this release
     Whatsnew resources in alphabetical order:
 
 .. _Pull Request Labeler GitHub action: https://github.com/actions/labeler
+.. _NPY002: https://docs.astral.sh/ruff/rules/numpy-legacy-random/
+.. _numpydoc validation: https://numpydoc.readthedocs.io/en/latest/validation.html#