doc: go1.8.html updates from Joe Tsai
doc: go1.8.html updates from Joe Tsai

Updates #17929

Change-Id: Ibc711d39d9ff83458d213778117493796b678aa7
Reviewed-on: https://go-review.googlesource.com/33437
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

codestation/go,cloudflare/go,ImJasonH/go,josharian/go,nawawi/go,cloudflare/go,derekmarcotte/go,cloudflare/go,CAFxX/go,nawawi/go,derekmarcotte/go,suncycheng/go,linux-on-ibm-z/go,Cofyc/go,derekmarcotte/go,vsekhar/elastic-go,Cofyc/go,christopher-henderson/Go,Cofyc/go,vsekhar/elastic-go,polyverse-security/go,goodlang/good,josharian/go,polyverse-security/go,codestation/go,CAFxX/go,josharian/go,golang/go,josharian/go,linux-on-ibm-z/go,CAFxX/go,nawawi/go,nawawi/go,Cofyc/go,akutz/go,akutz/go,akutz/go,Cofyc/go,suncycheng/go,derekmarcotte/go,goodlang/good,ImJasonH/go,golang/go,golang/go,goodlang/good,suncycheng/go,suncycheng/go,suncycheng/go,josharian/go,polyverse-security/go,linux-on-ibm-z/go,goodlang/good,vsekhar/elastic-go,ImJasonH/go,golang/go,CAFxX/go,suncycheng/go,CAFxX/go,polyverse-security/go,vsekhar/elastic-go,ImJasonH/go,nawawi/go,Cofyc/go,Cofyc/go,codestation/go,codestation/go,derekmarcotte/go,derekmarcotte/go,linux-on-ibm-z/go,codestation/go,cloudflare/go,cloudflare/go,polyverse-security/go,vsekhar/elastic-go,cloudflare/go,cloudflare/go,ImJasonH/go,akutz/go,suncycheng/go,josharian/go,CAFxX/go,nawawi/go,josharian/go,Cofyc/go,linux-on-ibm-z/go,vsekhar/elastic-go,nawawi/go,ImJasonH/go,CAFxX/go,goodlang/good,akutz/go,polyverse-security/go,golang/go,linux-on-ibm-z/go,nawawi/go,vsekhar/elastic-go,goodlang/good,golang/go,derekmarcotte/go,goodlang/good,suncycheng/go,josharian/go,linux-on-ibm-z/go,codestation/go,akutz/go,codestation/go,polyverse-security/go,polyverse-security/go,cloudflare/go,golang/go,codestation/go,CAFxX/go,akutz/go,ImJasonH/go,goodlang/good,vsekhar/elastic-go,golang/go,akutz/go,linux-on-ibm-z/go,ImJasonH/go,derekmarcotte/go