doc: fix links in v6 module #1647

Job	Run time
Tests / WebAssembly (wasm-bindgen)	38s
Build / MSRV	3m 35s
Build / Clippy	21s
Tests / Miri	1m 5s
Tests / OS: macos-latest - stable-x86_64-apple-darwin	3m 47s
Tests / Stable	36s
Tests / OS: ubuntu-latest - stable-x86_64-gnu	1m 28s
Tests / WebAssembly (WASI)	35s
Tests / OS: windows-latest - stable-x86_64-gnu	3m 15s
Build / Embedded	16s
Tests / OS: windows-latest - stable-x86_64-msvc	3m 47s
Tests / OS: macos-latest - beta-x86_64-apple-darwin	3m 35s
Build / No deps	1m 7s
Tests / OS: ubuntu-latest - beta-x86_64-gnu	1m 26s
Tests / OS: windows-latest - beta-x86_64-gnu	3m 21s
Tests / OS: windows-latest - beta-x86_64-msvc	2m 49s
Tests / OS: macos-latest - nightly-x86_64-apple-darwin	2m 49s
Tests / OS: ubuntu-latest - nightly-x86_64-gnu	1m 26s
Tests / OS: windows-latest - nightly-x86_64-gnu	3m 37s
Tests / OS: windows-latest - nightly-x86_64-msvc	2m 45s
	42m 18s

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