Resolve doc warning with global enums #2816

Job	Run time
doc-lints	45s
clippy	1m 50s
godot-itest (macos)	1m 13s
license-guard	35s
godot-itest (windows)	3m 6s
run-examples	1m 11s
godot-itest (linux-full)	2m 36s
godot-itest (linux-features-experimental)	1m 52s
rustfmt	17s
unit-test	2m 26s
godot-itest (linux-4.1)	1m 21s
godot-itest (linux-4.2)	1m 27s
godot-itest (linux-memcheck)	2m 16s
ci-status	2s
	20m 57s

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