docs(lib): do not inline http rexports #2880

Job	Run time
Check Style	11s
Verify hyper.h is up to date	28s
semver	1m 42s
Test stable on ubuntu-latest	1m 1s
Test stable on windows-latest	2m 6s
Test stable on macOS-latest	1m 14s
Test C API (FFI)	19s
Test beta on ubuntu-latest	1m 51s
Test with Miri	2m 22s
features	35s
Test beta on windows-latest	2m 4s
Test beta on macOS-latest	1m 5s
Check MSRV	1m 17s
Test nightly on ubuntu-latest	1m 6s
udeps	23s
Test nightly on windows-latest	2m 28s
Test nightly on macOS-latest	1m 25s
minimal-versions	36s
Build docs	17s
Check exposed types	16s
CI is green	1s
	22m 47s

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