Add changelog entries.

Its both a new feature and a small incompatibility.

diff --git a/doc/news/changes/incompatibilities/20230701DavidWells b/doc/news/changes/incompatibilities/20230701DavidWells
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+Changed: Most of the member functions of FEValues now have different template
+parameters. As a result, some function calls which relied on implicit
+conversions to ArrayView now require explicit conversions instead.
+<br>
+(David Wells, 2023/07/01)

diff --git a/doc/news/changes/major/20230701DavidWells b/doc/news/changes/major/20230701DavidWells
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+New: All vector classes in deal.II now inherit from ReadVector, which provides
+some common read operations.
+<br>
+(David Wells, 2023/07/01)