Check to force tools to initialize the ctx id to zero. (#1135)

* Check to force tool to initialize the ctx id to zero.

* initialize rocprofiler_context_id_t with 0 in units tests

* changelog

---------

Co-authored-by: Gopesh Bhardwaj <gopesh.bhardwaj@amd.com>

source/docs/api-reference/buffered_services.md

@@ -84,7 +84,7 @@ rocprofiler_assign_callback_thread(rocprofiler_buffer_id_t       buffer_id,
 ```cpp
 {
     // create a context
-    auto context_id = rocprofiler_context_id_t{};
+    auto context_id = rocprofiler_context_id_t{0};
     rocprofiler_create_context(&context_id);
 
     // create a buffer associated with the context