Add note for linux RIDs support

Author: mdh1418

docs/core/diagnostics/dotnet-trace.md

@@ -284,6 +284,9 @@ dotnet-trace collect
 > [!NOTE]
 > The collect-linux verb is a new preview feature and relies on an updated version of the .nettrace file format. The latest PerfView release supports these trace files but other ways of using the trace file may not work yet.
 
+> [!NOTE]
+> Currently supported Linux RIDs are linux-x64 and linux-arm64.
+
 > [!NOTE]
 > The generated NetTrace is not fully compatible with [`convert`](#dotnet-trace-convert) and [`report`](#dotnet-trace-report).