milestones test guidance

Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Co-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>

Author: 3 people

doc/devel/coding_guide.rst

@@ -136,11 +136,11 @@ Milestones
   * *New features and API changes* are milestoned for the next minor release
     ``v3.N.0``.
 
-  * *Bugfixes and docstring changes* are milestoned for the next patch
-    release ``v3.N.M``
+  * *Bugfixes, tests for released code, and docstring changes* are milestoned
+  for the next patch release ``v3.N.M``.
 
   * *Documentation changes* (all .rst files and examples) are milestoned
-    ``v3.N-doc``
+    ``v3.N-doc``.
 
   If multiple rules apply, choose the first matching from the above list.