Fix docs.rs #1785

Job	Run time
Docs	20s
Test	37s
cargo-deny (aarch64-apple-ios)	18s
Test (json)	37s
Lint	15s
cargo-deny (aarch64-linux-android)	21s
Test (charset)	49s
cargo-deny (i686-pc-windows-gnu)	18s
Test (cookies)	41s
cargo-deny (i686-pc-windows-msvc)	19s
Test (socks-proxy)	36s
cargo-deny (i686-unknown-linux-gnu)	21s
Test (native-certs)	47s
cargo-deny (wasm32-unknown-unknown)	19s
Test (gzip)	37s
cargo-deny (x86_64-apple-darwin)	20s
Test (brotli)	40s
cargo-deny (x86_64-apple-ios)	21s
Test (http-crate)	39s
cargo-deny (x86_64-pc-windows-gnu)	18s
Test (http-interop)	36s
cargo-deny (x86_64-pc-windows-msvc)	18s
Test (http-crate http-interop)	40s
cargo-deny (x86_64-unknown-linux-gnu)	21s
Test (tls)	45s
cargo-deny (x86_64-unknown-redox)	19s
Test (tls, json)	57s
Test (tls, charset)	54s
Test (tls, cookies)	56s
Test (tls, socks-proxy)	44s
Test (tls, native-certs)	51s
Test (tls, gzip)	48s
Test (tls, brotli)	43s
Test (tls, http-crate)	43s
Test (tls, http-interop)	45s
Test (tls, http-crate http-interop)	58s
Test (native-tls)	39s
Test (native-tls, json)	43s
Test (native-tls, charset)	39s
Test (native-tls, cookies)	48s
Test (native-tls, socks-proxy)	40s
Test (native-tls, native-certs)	43s
Test (native-tls, gzip)	42s
Test (native-tls, brotli)	52s
Test (native-tls, http-crate)	48s
Test (native-tls, http-interop)	44s
Test (native-tls, http-crate http-interop)	1m 19s
	29m 28s

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