Add a changelog entry.

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+Changed: The step-43 tutorial program used `Amg_preconditioner` and
+`Mp_preconditioner` to denote the preconditioners for the top left and
+bottom right block of a mixed-Laplace matrix. These variable names
+were taken from step-31/step-32 where they made sense, but in the
+current context, the names do not reflect what is in the corresponding
+matrix blocks. They have been renamed to `top_left_preconditioner` and
+`bottom_right_preconditioner`, respectively.
+<br>
+(Wolfgang Bangerth, 2022/01/07)