go/types: fix typo
go/types: fix typo

Fixes #18562

Change-Id: Ic195a8606f09876e2667e4ef720b84a07d316f4a
Reviewed-on: https://go-review.googlesource.com/34939
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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