doc: fix fileset filtering (#784) #1357

Job	Run time
check-fmt	36s
check-dead-code	24s
examples-darwin	5m 29s
examples-linux (alt-registry)	1m 57s
examples-linux (build-std)	1m 39s
tests (https://nixos.org/nix/install)	2m 14s
examples-linux (cross-musl)	1m 38s
tests (https://releases.nixos.org/nix/nix-2.24.10/install, --override-input nixpkgs $(./ci/ref-fr...	2m 19s
examples-linux (cross-rust-overlay)	1m 34s
examples-linux (cross-windows)	1m 34s
examples-linux (custom-toolchain)	1m 32s
examples-linux (end-to-end-testing)	1m 36s
examples-linux (quick-start)	1m 55s
examples-linux (quick-start-simple)	1m 55s
examples-linux (quick-start-workspace)	2m 9s
examples-linux (sqlx)	2m 13s
examples-linux (trunk-workspace)	1m 37s
examples-linux (trunk)	1m 40s
all systems go	0s
	34m 1s

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