doc/1.9: add CL 44074 for net/http to the release notes
doc/1.9: add CL 44074 for net/http to the release notes

Change-Id: I2eb4f9531372c792a98578560e946d803ad96da8
Reviewed-on: https://go-review.googlesource.com/54411
Reviewed-by: Joe Tsai <7277d7402195d5c2006c89f45718cf82bb3e527f@gmail.com>

CAFxX/go,Cofyc/go,akutz/go,polyverse-security/go,codestation/go,CAFxX/go,golang/go,cloudflare/go,CAFxX/go,akutz/go,josharian/go,josharian/go,polyverse-security/go,polyverse-security/go,Cofyc/go,cloudflare/go,cloudflare/go,nawawi/go,golang/go,CAFxX/go,Cofyc/go,codestation/go,cloudflare/go,akutz/go,nawawi/go,codestation/go,josharian/go,Cofyc/go,akutz/go,polyverse-security/go,codestation/go,josharian/go,polyverse-security/go,nawawi/go,cloudflare/go,golang/go,golang/go,polyverse-security/go,nawawi/go,josharian/go,CAFxX/go,nawawi/go,polyverse-security/go,codestation/go,nawawi/go,golang/go,nawawi/go,josharian/go,akutz/go,cloudflare/go,josharian/go,akutz/go,codestation/go,Cofyc/go,polyverse-security/go,CAFxX/go,golang/go,codestation/go,Cofyc/go,CAFxX/go,Cofyc/go,christopher-henderson/Go,cloudflare/go,akutz/go,golang/go,cloudflare/go,codestation/go,Cofyc/go,golang/go,akutz/go,CAFxX/go,nawawi/go,josharian/go