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docs(core): Fix comment for into_futures_async_write #7039

Job	Run time
build-java-doc	17s
build-nodejs-doc	31s
build-python-doc	3m 11s
build-rust-doc	3m 37s
build-c-doc	28s
build-cpp-doc	40s
build-dav-server-opendalfs-doc	45s
build-fuse3-opendal-doc	47s
build-haskell-doc	10m 7s
build-lua-doc	8s
build-object-store-opendal-doc	50s
build-ocaml-doc	4m 53s
build-unftp-sbe-opendal-doc	1m 17s
build-virtiofs-opendal-doc	32s
build-website	3m 22s
	31m 25s

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