remove broken link etc. (#234)

docs/index.rst

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 rocSHMEM documentation
 ****************************
 
-The ROCm OpenSHMEM (rocSHMEM) is an intra-kernel networking library that provides GPU-centric networking through an `OpenSHMEM-like <http://www.openshmem.org/site/>`_ interface. It simplifies application code complexity and enables finer communication and computation overlap than traditional host-driven networking. rocSHMEM uses a single symmetric heap (SHEAP) allocated to GPU memories. For more information, see :doc:`introduction`
+The ROCm OpenSHMEM (rocSHMEM) is an intra-kernel networking library that provides GPU-centric networking through an OpenSHMEM-like interface. It simplifies application code complexity and enables finer communication and computation overlap than traditional host-driven networking. rocSHMEM uses a single symmetric heap allocated to GPU memories. For more information, see :doc:`introduction`.
 
 The rocSHMEM public repository is located at `<https://github.com/ROCm/rocSHMEM>`_.