Update ROCTracer README for the GitHub link (#1745)

* Update README for the GitHub link

* Updating links to rocm-systems

projects/rocprofiler-sdk/source/docs/api-reference/callback_services.rst

@@ -339,4 +339,4 @@ Here is the general sequence of events when a code object is loaded and unloaded
     all buffers that might contain references to that code object or kernel symbol identifier before
     deleting the associated data.
 
-For a sample of code object tracing, see `samples/code_object_tracing <https://github.com/ROCm/rocprofiler-sdk/tree/amd-mainline/samples/code_object_tracing>`_.
+For a sample of code object tracing, see `samples/code_object_tracing <https://github.com/ROCm/rocm-systems/tree/develop/projects/rocprofiler-sdk/samples/code_object_tracing>`_.