Better document the header version VK_DRIVER_FILES was added #2910

Job	Run time
codegen	16s
linux-no-asm	3m 34s
linux (gcc, g++, Debug, ubuntu-20.04)	2m 56s
linux (gcc, g++, Debug, ubuntu-22.04)	3m 16s
linux (gcc, g++, Release, ubuntu-20.04)	6m 55s
chromium	1m 23s
linux (gcc, g++, Release, ubuntu-22.04)	6m 58s
linux-32-no-asm	2m 7s
linux (clang, clang++, Debug, ubuntu-20.04)	2m 11s
linux-32 (Debug)	1m 44s
linux (clang, clang++, Debug, ubuntu-22.04)	2m 50s
linux-32 (Release)	2m 16s
linux (clang, clang++, Release, ubuntu-20.04)	4m 29s
linux (clang, clang++, Release, ubuntu-22.04)	5m 2s
mingw	1m 32s
windows_vs-no-asm (Win32)	3m 12s
windows_vs-no-asm (x64)	4m 6s
mingw-no-asm	1m 12s
mingw-no-asm-explicit	1m 5s
windows_clang (clang, Debug)	3m 32s
windows_vs (Win32, Debug)	4m 47s
windows_clang (clang, Release)	3m 32s
windows_vs (Win32, Release)	4m 26s
mingw-use-gas	1m 13s
windows_clang (clang-cl, Debug)	3m 31s
windows_vs (x64, Debug)	4m 0s
windows_vs (x64, Release)	4m 45s
windows_clang (clang-cl, Release)	2m 48s
mac (Debug, APPLE_STATIC_LOADER=ON)	4m 0s
mac (Debug, APPLE_STATIC_LOADER=OFF)	4m 38s
iOS	47s
mac (Release, APPLE_STATIC_LOADER=ON)	5m 47s
Universal Binary Testing (STATIC ON) w/ Ninja	1m 50s
tvOS	56s
mac (Release, APPLE_STATIC_LOADER=OFF)	4m 13s
Universal Binary Testing (STATIC ON) w/ Xcode	2m 6s
Universal Binary Testing (STATIC OFF) w/ Ninja	1m 45s
Universal Binary Testing (STATIC OFF) w/ Xcode	2m 24s
	1h 58m 4s

Provide feedback