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

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

[ROCm/rocshmem commit: 6e7277b544]

projects/rocshmem/tests/functional_tests/wavefront_primitives.cpp

@@ -42,7 +42,6 @@ __global__ void WaveFrontPrimitiveTest(int loop, int skip,
   __shared__ rocshmem_ctx_t ctx;
   int wg_id = get_flat_grid_id();
 
-  rocshmem_wg_init();
   rocshmem_wg_ctx_create(ctx_type, &ctx);
 
   // Calculate start index for each wavefront
@@ -86,7 +85,6 @@ __global__ void WaveFrontPrimitiveTest(int loop, int skip,
   }
 
   rocshmem_wg_ctx_destroy(&ctx);
-  rocshmem_wg_finalize();
 }
 
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