chore: enable `format_code_in_doc_comments` for rustfmt #606

Job	Run time
integration-test-eigenlayer	5m 58s
cargo clippy	17m 54s
cargo test (gadget-sdk)	2m 49s
Rustfmt	22s
cargo test (blueprint-manager)	1m 34s
cargo test (gadget-context-derive)	15m 43s
cargo test (gadget-blueprint-proc-macro)	11m 29s
cargo test (gadget-blueprint-proc-macro-playground)	4m 28s
	1h 0m 17s

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