Include .rbi shims in yard docs #26344

Job	Run time
syntax	48s
vendored gems	46s
docker	4m 11s
cask audit	2m 26s
formula audit	6m 3s
tap syntax	4m 52s
test default formula (Ubuntu 22.04)	4m 8s
test default formula (Ubuntu 20.04)	5m 32s
update-test (Ubuntu 22.04)	1m 3s
test default formula (macOS 13 x86_64)	2m 36s
tests (online)	7m 26s
update-test (macOS 13)	50s
test default formula (macOS 14 arm64)	1m 27s
tests (generic OS)	5m 27s
tests (Ubuntu 22.04)	5m 37s
tests (Ubuntu 20.04)	5m 58s
tests (macOS 13 x86_64)	7m 46s
tests (macOS 14 arm64)	8m 41s
	1h 15m 37s

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