Cleanup/wg init (#260)

* remove wg_init and wg_finalize from functional tests

* Remove wg_init and wg_finalize from examples

* deprecate wg_init/finalize

* Updated docs

* Typo in documentation

---------

Co-authored-by: Yiltan <yiltan@amd.com>

[ROCm/rocshmem commit: 6e7277b544]

projects/rocshmem/tests/functional_tests/amo_bitwise_tester.cpp

@@ -254,7 +254,6 @@ void AMOBitwiseTester<T>::verifyResults(size_t size) {
     int global_id = get_flat_id();                                            \
     int n_threads = get_flat_grid_size();                                     \
     int n_wgs     = get_grid_num_blocks();                                    \
-    rocshmem_wg_init();                                                       \
     rocshmem_wg_ctx_create(ctx_type, &ctx);                                   \
     for (int i = 0; i < loop + skip; i++) {                                   \
       T *ptr = compute_target_ptr<T>(dest, addr_mode, wg_id, i, n_wgs);       \
@@ -293,7 +292,6 @@ void AMOBitwiseTester<T>::verifyResults(size_t size) {
     end_time[wg_id] = wall_clock64();                                         \
     __syncthreads();                                                          \
     rocshmem_wg_ctx_destroy(&ctx);                                            \
-    rocshmem_wg_finalize();                                                   \
   }                                                                           \
   template class AMOBitwiseTester<T>;