Convert all allow(missing_docs) to expects (#533) #430

Job	Run time
build mdbook guide	1m 27s
build artifacts [aarch64-linux]	6m 23s
build and check docs [x64-windows]	9m 22s
build openhcl [aarch64-linux]	7m 49s
build artifacts [x64-linux]	7m 4s
build openhcl [x64-linux]	9m 53s
clippy [windows], unit tests [x64-windows]	17m 31s
clippy [linux, macos], unit tests [x64-linux]	12m 49s
clippy [linux-musl, misc nostd], unit tests [x64-linux-musl]	12m 13s
unit tests [aarch64-windows]	8m 48s
build and check docs [x64-linux]	2m 44s
test flowey local backend	3m 13s
xtask fmt (linux)	2m 21s
build artifacts (not for VMM tests) [aarch64-windows]	5m 43s
build artifacts (for VMM tests) [aarch64-windows]	16m 36s
build artifacts (not for VMM tests) [x64-windows]	6m 53s
build artifacts (for VMM tests) [x64-windows]	17m 4s
xtask fmt (windows)	8m 46s
publish openvmm.dev	46s
run vmm-tests [aarch64-windows]	6m 37s
run vmm-tests [x64-linux]	3m 37s
run vmm-tests [x64-windows-amd]	7m 54s
run vmm-tests [x64-windows-intel]	7m 16s
	3h 2m 49s

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