Add a changelog entry

diff --git a/doc/news/changes/minor/20210806Jean-PaulPelteret b/doc/news/changes/minor/20210806Jean-PaulPelteret
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+New: The functions FEFaceValuesBase::face_number(), FEInterfaceValues::get_cell()
+and FEInterfaceValues::face_number() have been implemented to provide
+introspection as to which entities these objects have been initialized for.
+<br>
+(Jean-Paul Pelteret, 2021/08/06)