[AMDGPU][Doc] Add gfx950 to gfx9-4-generic in the document

Author: shiltian

llvm/docs/AMDGPUUsage.rst

@@ -586,7 +586,7 @@ Generic processor code objects are versioned. See :ref:`amdgpu-generic-processor
      ``gfx9-4-generic``   ``amdgcn``     - ``gfx940``      - xnack            - Absolute flat   FP8 and BF8 instructions,
                                          - ``gfx941``      - sramecc            scratch         FP8 and BF8 conversion instructions,
                                          - ``gfx942``                                           as well as instructions with XF32 format support
-                                                                                                are not available.
+                                         - ``gfx950``                                           are not available.
 
 
      ``gfx10-1-generic``  ``amdgcn``     - ``gfx1010``     - xnack            - Absolute flat   - The following instructions are