doc: remove mention of %HOME% from installation instructions
doc: remove mention of %HOME% from installation instructions

Fixes #15598

Change-Id: I4cfb8799dab0e9e34cae2e61839911fd65e4cfa3
Reviewed-on: https://go-review.googlesource.com/23004
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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