chore(24.10): add comments to override dotnet9 in sdf

slices/dotnet-host-9.0.yaml

@@ -13,6 +13,11 @@ slices:
       # This copy is done to avoid Chisel's current handling of conflicts, as
       # it flags a conflict between this slice and .NET8's, even if the two
       # are not being installed at the same time.
+      # Override the installed slice using the following commands:
+      # ```
+      # mv ${rootfs}/usr/lib/dotnet/dotnet9 ${rootfs}/usr/lib/dotnet/dotnet
+      # ln -s ../lib/dotnet/dotnet ${rootfs}/usr/bin/dotnet
+      # ```
       # TODO: once Chisel can cope with duplicate contents within the same
       # release, this copy can be suppressed
       /usr/lib/dotnet/dotnet9: {copy: /usr/lib/dotnet/dotnet}