spec: New year, new spec update (to refer to Unicode 8.0).
spec: New year, new spec update (to refer to Unicode 8.0).

Slightly rephrased sentence to emphasize the contents of the
Unicode categories w/o repeating the full category name each
time.

Fixes #13414.

Change-Id: Icd32ff1547fa81e866c5937a631c3344bb6087c6
Reviewed-on: https://go-review.googlesource.com/18265
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

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