[clang] [llvm] Update ReleaseNotes for MC/DC changes. (PR #95887)

[via llvm-commits]

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@@ -586,6 +586,20 @@ Improvements to Clang's time-trace
 - Clang now specifies that using ``auto`` in a lambda parameter is a C++14 extension when
   appropriate. (`#46059: <https://github.com/llvm/llvm-project/issues/46059>`_).
 
+Improvements to Coverage mapping
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zmodem wrote:

nit: capital m?

https://github.com/llvm/llvm-project/pull/95887