docs: mention json region reporting in the changes

CHANGES.rst

@@ -31,14 +31,20 @@ Unreleased
   (arbitrary sequence of marked lines).  See the :ref:`multi_line_exclude`
   section of the docs for more details and examples.
 
+- The JSON report now includes per-function and per-class coverage information.
+  Thanks to `Daniel Diniz <pull 1809_>`_ for getting the work started.
+
+- Fixed an incorrect calculation of "(no class)" lines in the HTML classes
+  report.
+
 - Python 3.13.0b3 is supported.
 
 .. _issue 118: https://github.com/nedbat/coveragepy/issues/118
 .. _issue 996: https://github.com/nedbat/coveragepy/issues/996
 .. _issue 1741: https://github.com/nedbat/coveragepy/issues/1741
 .. _issue 1803: https://github.com/nedbat/coveragepy/issues/1803
-
 .. _pull 1807: https://github.com/nedbat/coveragepy/pull/1807
+.. _pull 1809: https://github.com/nedbat/coveragepy/pull/1809
 
 .. scriv-start-here
 
@@ -57,8 +63,6 @@ Version 7.5.4 — 2024-06-22
 - Fixed a minor branch coverage problem with wildcard match/case cases using
   names or guard clauses.
 
-- Fixed an incorrect calculation of "(no class)" lines in the classes report.
-
 - Started testing on 3.13 free-threading (nogil) builds of Python.  I'm not
   claiming full support yet.  Closes `issue 1799`_.