cmd/cgo: add missing period in comment
cmd/cgo: add missing period in comment

Change-Id: I05f31938f3736100bd8b20a150c9fe3a6ffcdeae
Reviewed-on: https://go-review.googlesource.com/33245
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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