doc/go1.17: fix formatting near httptest
doc/go1.17: fix formatting near httptest

Change-Id: Ic1a0add3a1e137ca5cd0f3e9ce3266191b0b55cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/326777
Trust: Alberto Donizetti <90b16103a35511ced020676f3544f17117fb4c92@gmail.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>

CAFxX/go,golang/go,CAFxX/go,golang/go,nawawi/go,cloudflare/go,nawawi/go,nawawi/go,CAFxX/go,nawawi/go,CAFxX/go,CAFxX/go,cloudflare/go,golang/go,nawawi/go,nawawi/go,golang/go,golang/go,cloudflare/go,cloudflare/go,nawawi/go,cloudflare/go,golang/go,golang/go,cloudflare/go,CAFxX/go,nawawi/go,CAFxX/go,golang/go,cloudflare/go,cloudflare/go,CAFxX/go