go/types: add link to tutorial
go/types: add link to tutorial

Change-Id: Ic4f4bc7ea7478908716b951815280e394c55310b
Reviewed-on: https://go-review.googlesource.com/17975
Reviewed-by: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

miolini/go,mwhudson/go,theif519/go,momchil-velikov/go,binarycrusader/go,codestation/go,momchil-velikov/go,Samurais/go,kim-racktop/go,cloudflare/go,nawawi/go,vanloswang/go,miolini/go,momchil-velikov/go,akutz/go,4ad/go,goodlang/good,miolini/go,akutz/go,Samurais/go,polyverse-security/go,sndnvaps/go,cloudflare/go,ImJasonH/go,ganboing/go-esx,akutz/go,sndnvaps/go,Cofyc/go,Cofyc/go,linux-on-ibm-z/go,momchil-velikov/go,CAFxX/go,goodlang/good,theif519/go,miolini/go,kim-racktop/go,polyverse-security/go,goodlang/good,CAFxX/go,ganboing/go-esx,josharian/go,golang/go,mwhudson/go,derekmarcotte/go,linux-on-ibm-z/go,theif519/go,4ad/go,kim-racktop/go,theif519/go,Cofyc/go,cyberroadie/go,4ad/go,mwhudson/go,golang/go,kim-racktop/go,golang/go,nawawi/go,cloudflare/go,mwhudson/go,mwhudson/go,4ad/go,roth1002/go,goodlang/good,akutz/go,Endika/go,polyverse-security/go,derekmarcotte/go,polyverse-security/go,vanloswang/go,cyberroadie/go,derekmarcotte/go,miolini/go,sndnvaps/go,polyverse-security/go,derekmarcotte/go,suncycheng/go,Endika/go,goodlang/good,Samurais/go,akutz/go,linux-on-ibm-z/go,ganboing/go-esx,cyberroadie/go,theif519/go,vsekhar/elastic-go,vsekhar/elastic-go,binarycrusader/go,4ad/go,josharian/go,josharian/go,cyberroadie/go,linux-on-ibm-z/go,sndnvaps/go,akutz/go,polyverse-security/go,Endika/go,akutz/go,vanloswang/go,CAFxX/go,theif519/go,golang/go,nawawi/go,sndnvaps/go,momchil-velikov/go,vanloswang/go,vanloswang/go,Samurais/go,linux-on-ibm-z/go,ImJasonH/go,Endika/go,ganboing/go-esx,goodlang/good,Cofyc/go,derekmarcotte/go,roth1002/go,CAFxX/go,mwhudson/go,codestation/go,CAFxX/go,polyverse-security/go,josharian/go,mwhudson/go,vsekhar/elastic-go,goodlang/good,momchil-velikov/go,suncycheng/go,derekmarcotte/go,mwhudson/go,cyberroadie/go,josharian/go,cloudflare/go,ganboing/go-esx,binarycrusader/go,codestation/go,cyberroadie/go,nawawi/go,suncycheng/go,kim-racktop/go,suncycheng/go,momchil-velikov/go,miolini/go,ganboing/go-esx,binarycrusader/go,sndnvaps/go,cloudflare/go,nawawi/go,derekmarcotte/go,theif519/go,Endika/go,4ad/go,vsekhar/elastic-go,ImJasonH/go,nawawi/go,binarycrusader/go,Endika/go,ImJasonH/go,Cofyc/go,suncycheng/go,ganboing/go-esx,cloudflare/go,Samurais/go,vanloswang/go,roth1002/go,vanloswang/go,kim-racktop/go,josharian/go,josharian/go,roth1002/go,vsekhar/elastic-go,ganboing/go-esx,CAFxX/go,nawawi/go,codestation/go,suncycheng/go,binarycrusader/go,binarycrusader/go,akutz/go,cloudflare/go,christopher-henderson/Go,ImJasonH/go,vsekhar/elastic-go,golang/go,sndnvaps/go,cyberroadie/go,roth1002/go,Samurais/go,ImJasonH/go,theif519/go,josharian/go,nawawi/go,codestation/go,sndnvaps/go,cloudflare/go,kim-racktop/go,linux-on-ibm-z/go,kim-racktop/go,Cofyc/go,binarycrusader/go,vsekhar/elastic-go,goodlang/good,roth1002/go,roth1002/go,suncycheng/go,linux-on-ibm-z/go,vsekhar/elastic-go,CAFxX/go,Samurais/go,derekmarcotte/go,linux-on-ibm-z/go,codestation/go,cyberroadie/go,Cofyc/go,4ad/go,Endika/go,Cofyc/go,miolini/go,Samurais/go,momchil-velikov/go,vanloswang/go,codestation/go,ImJasonH/go,codestation/go,CAFxX/go,golang/go,golang/go,roth1002/go,polyverse-security/go,miolini/go,Endika/go,golang/go,4ad/go,ImJasonH/go,suncycheng/go