doc/devel: update release.html for new support policy
doc/devel: update release.html for new support policy

Fixes #19069.

Change-Id: I211a304ec57d6b94366af4c0db413c8055b9634d
Reviewed-on: https://go-review.googlesource.com/37531
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Reviewed-by: Steve Francia <97224216d9b4001d2da5fac1d1d534510be40bbe@golang.org>

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