Add a changelog entry.

diff --git a/doc/news/changes/minor/20230305Bangerth b/doc/news/changes/minor/20230305Bangerth
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+Fixed: It was previously possible to assign scalar values to
+VectorizedArray objects that were temporaries -- say in expressions
+such as
+```
+  VectorizedArray<...> my_function();
+  ...
+  my_function() = 1.234;
+```
+This does not make any sense: What `my_function()` returns is a
+temporary object, and assigning a value to it has no consequences
+because the temporary object dies at the end of the line. Whatever the
+programmer intended to do here was almost certainly a mistake.
+
+As a consequence, this is now prohibited and the compiler will produce
+an error when trying to do this.
+<br>
+(Wolfgang Bangerth, 2023/03/05)