Add discussion of processing frameworks being responsible for all def… #891

Job	Run time
Verify repository license compliance	40s
Build the core-only spec, to try and catch ifdef errors in extension markup	49s
Build the vulkan specification and generate any associated files (such as vulkan.h)	5m 53s
Run Vulkan CTS framework tests to validate against XML changes	1m 38s
Build a test spec and check against expectation, to make sure the spec toolchain works as expected	1m 17s
Run various checker scripts on the spec and XML sources	48s
Generate the vulkan C++ header (vulkan.hpp)	1m 4s
Generate Rust bindings (Ash crate)	33s
Compile a simple test program that uses vulkan.h	10s
Build-test Rust bindings (Ash crate)	3s
Compile a simple test program that uses vulkan.hpp	21s
	13m 16s

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