Update releasenote

Author: AmrDeveloper

llvm/docs/ReleaseNotes.md

@@ -130,7 +130,8 @@ Changes to the Debug Info
 Changes to the LLVM tools
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-- llvm-objcopy now correct path in error message when section output path doesn't exist.
+- llvm-objcopy now prints the correct file path in the error message when
+the output file specified by --dump-section cannot be opened.
 
 Changes to LLDB
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