Add changelog entry for 'active_fe_index' fix

diff --git a/doc/news/changes/minor/20231113DavidSchneider b/doc/news/changes/minor/20231113DavidSchneider
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+Fixed: MatrixFree::get_cell_active_fe_index did not
+return the correct value when used with categorization
+of cells. This affects also MFTools::compute_diagonal().
+This is now fixed.
+<br>
+(David Schneider, 2023/11/13)