Add changelog entries.

diff --git a/doc/news/changes/minor/20211025Bangerth b/doc/news/changes/minor/20211025Bangerth
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+New: The ReferenceCell class now has input and output operators (`>>`
+and `<<`).
+<br>
+(Wolfgang Bangerth, 2020/10/25)

diff --git a/doc/news/changes/minor/20211025Bangerth-b b/doc/news/changes/minor/20211025Bangerth-b
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+Changed: The DataOutBase::write_deal_II_intermediate() function had a
+bug when outputting data that corresponds to cells other than
+hypercubes. This is now fixed. In the process, the format version for
+this function's output has been incremented from 3 to 4, which also
+includes changing the order in which vertices are outputted.
+<br>
+The DataOutReader class was also updated to match the new output
+format.
+<br>
+(Wolfgang Bangerth, 2020/10/25)