Some typo and documentation fixes (#1072) #1619

Job	Run time
build-test-default (ubuntu-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-...	5m 53s
build-test-cohttp-bench (ubuntu-latest, 5.x, *.opam )	7m 16s
build-test-cohttp-async (ubuntu-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !c...	6m 10s
build-test-default (ubuntu-latest, 5.x, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	7m 40s
build-test-cohttp-eio (ubuntu-latest, 5.x, http.opam cohttp.opam cohttp-eio.opam )	4m 13s
build-test-cohttp-async (ubuntu-latest, 5.x, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	9m 38s
build-test-default (macos-latest, 4.14, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-a...	1m 57s
build-test-cohttp-eio (macos-latest, 5.x, http.opam cohttp.opam cohttp-eio.opam )	4m 13s
build-test-cohttp-async (macos-latest, 4.14, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !co...	2m 8s
build-test-default (macos-latest, 5.x, *.opam !cohttp-eio.opam !cohttp-curl-async.opam !cohttp-as...	5m 17s
build-test-cohttp-async (macos-latest, 5.x, *.opam !cohttp-mirage.opam !cohttp-curl-lwt.opam !coh...	7m 57s
	1h 2m 22s

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