doc: add note about CL 24180 to go1.8.txt
doc: add note about CL 24180 to go1.8.txt

Change-Id: Ie2bef1c181a49d7a02ed8068894d2bd81fc5bafa
Reviewed-on: https://go-review.googlesource.com/27566
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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