docs/features: Update status list of Vulkan extensions

To get the extension list:

$ git grep -hE "extension name=\"VK_KHR" src/vulkan/registry/vk.xml | \
grep -v disabled | awk '{print $2}' | sed -E 's/(name=)?"//g' | sort

To find anv(il) and radv supported extensions:

$ git grep -hE "'VK_([A-Z]+)_[a-z,0-9]" src/intel/

$ git grep -hE "'VK_([A-Z]+)_[a-z,0-9]" src/amd/

v2:
  - Keep VK_KHR_device_group and VK_KHR_device_group_creation as not
    started (Jason).

Signed-off-by: Andres Gomez <agomez@igalia.com>
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

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