Add incompatibility change-log entry: L:d:V in MatrixFree

diff --git a/doc/news/changes/incompatibilities/20201021Munch b/doc/news/changes/incompatibilities/20201021Munch
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+Changed: MatrixFree::loop() only accepts LinearAlgebra::distributed::Vector arguments
+that have been initialized via MatrixFree::initialize_dof_vector()
+and are as a consequence globally compatible with the 
+Utilities::MPI::Partitioner within internal::MatrixFreeFunctions::DoFInfo. 
+<br>
+(Peter Munch, Martin Kronbichler, 2020/10/21)