doc: document archive/tar changes
doc: document archive/tar changes

Fixes #13647.

Change-Id: I28df7ade9b5abd79ce6b9c3d14ceaa988e86fc01
Reviewed-on: https://go-review.googlesource.com/18642
Run-TryBot: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

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