Adding change log for #18576

doc/changelog/04-tactics/18576-master+fix4056-refolding-simpl-cofix.rst

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+- **Fixed:**
+  The name of a cofixpoint globally defined with a name is now
+  systematically reused by :tacn:`simpl` after reduction, even when
+  the named cofixpoint is mutually defined or defined in a section
+  (`#18576 <https://github.com/coq/coq/pull/18576>`_,
+  fixes `#4056 <https://github.com/coq/coq/issues/4056>`_,
+  by Hugo Herbelin).