DOCS: Updated LoaderAndTools doc to indicate updated ImageMagick requirements.
DOCS: Updated LoaderAndTools doc to indicate updated ImageMagick requirements.

Updated docs to indicate that both 32-bit and 64-bit installs of ImageMagick are required.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools