reflect: update location of vet tool in comment
reflect: update location of vet tool in comment

Change-Id: Ic5160edbbca4a8ffc7c7e6246e34fae1978470fd
Reviewed-on: https://go-review.googlesource.com/28912
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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