samples_index : Change http: to https: per Dan F.
samples_index : Change http: to https: per Dan F.

Change-Id: I057ed9724d991eee79ae2566e524ebb6ecf40b95

Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples