[changelog] add entry about example testing in CI

CHANGELOG.md

@@ -6,6 +6,9 @@ Differences Between DuMu<sup>x</sup> 3.7 and DuMu<sup>x</sup> 3.6
 - __Testing/CI__: One of the CI pipelines now includes a build of the `doxygen` documentation. The result of this
 build can be downloaded from the job artifacts.
 
+- __Testing/CI__: The example documentation is now re-generated in the CI in order to verify that the generated README
+files are in sync with the sources from which they are produced.
+
 ### Improvements and Enhancements
 
 - __IO/RasterImageWriter__: A tool now exists for writing `.pbm` and `.pgm` image files.