fix(iroh): do not double-close docs on drop #8657

Job	Run time
check_semver	4m 56s
Checking fmt	15s
cargo deny	28s
Checking docs	1m 11s
Cross Build Only (armv7-linux-androideabi)	1m 3s
clippy_check	2m 52s
Cross Test (i686-unknown-linux-gnu)	2m 31s
Cross Build Only (aarch64-linux-android)	1m 1s
Minimal Supported Rust Version	1m 13s
Cross Build Only (x86_64-unknown-freebsd)	1m 8s
Run network simulations/benchmarks	7m 2s
Cross Build Only (x86_64-unknown-netbsd)	1m 8s
Build wasm32	28s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 52s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	3m 57s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 11s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	3m 48s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 33s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	3m 46s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	3m 27s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	3m 18s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	3m 0s
	54m 8s

Provide feedback