Add a changelog entry.

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+New: step-9 uses the "streamline-upwind Petrov-Galerkin" method, but
+does not make any attempt at explaining what this method is or why it
+might be named like this. This has been rectified: The introduction
+now has a long section that explains the origin of the method and its name.
+<br>
+(Wolfgang Bangerth, 2020/10/10)