sort: Fix typo in stable sort comment
sort: Fix typo in stable sort comment

Fix `reverences`, which I believe should read as `references`.

Change-Id: I450efcbeee0f8861a84b209f2e6636764034232a
Reviewed-on: https://go-review.googlesource.com/19469
Reviewed-by: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

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