cell_weight: add changelog for bugfix.

diff --git a/doc/news/changes/incompatibilities/20220225Fehling2 b/doc/news/changes/incompatibilities/20220225Fehling2
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+Fixed: Callback functions attached to any weighted load balancing signal
+of parallel::distributed::Triangulation objects now need to handle cells
+with CELL_INVALID status explicitely.
+<br>
+If a cell gets refined, only the first child has the CELL_REFINE status,
+while all other children are CELL_INVALID.
+<br>
+(Marc Fehling, 2022/02/25)