Revert "adjust wording"

This reverts commit 9bf74a3.

src/OpenTelemetry/Trace/ExceptionProcessor.cs

@@ -39,7 +39,7 @@ public ExceptionProcessor()
             }
             catch (Exception ex)
             {
-                throw new NotSupportedException("Automatic exception detection is not supported on this platform.", ex);
+                throw new NotSupportedException("System.Runtime.InteropServices.Marshal.GetExceptionPointers is not supported.", ex);
             }
         }