[clang] [llvm] Update documentation and release notes for llvm-profgen COFF support (PR #84864)

[Haohai Wen via llvm-commits]

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@@ -2454,7 +2481,14 @@ usual build cycle when using sample profilers for optimization:
 
    .. code-block:: console
 
-     $ llvm-profgen --binary=./code --output=code.prof--perfdata=perf.data
+     $ llvm-profgen --binary=./code --output=code.prof --perfdata=perf.data
+
+   When using SEP the output is in the textual format corresponding to
+   ``llvm-profgen --perfscript``. For example:
+
+   .. code-block:: console
+
+     $ llvm-profgen --binary=./code --output=code.prof --perfscript=perf.data.script
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HaohaiWen wrote:

code.perf.data.script

https://github.com/llvm/llvm-project/pull/84864