move to frozen state

Author: bcstrongx

header.adoc

@@ -5,7 +5,7 @@ Authors: Beeman Strong
 :company: RISC-V.org
 :revdate: 06/28/2023
 :revnumber: 1.0_rc1
-:revremark: This document is stable. Visit http://riscv.org/spec-state for further details.
+:revremark: This document is Frozen. Visit http://riscv.org/spec-state for further details.
 :revinfo:
 :url-riscv: http://riscv.org
 :doctype: book
@@ -39,9 +39,9 @@ endif::[]
 :xrefstyle: short
 
 [WARNING]
-.This document is in the link:http://riscv.org/spec-state[Stable state]
+.This document is in the link:http://riscv.org/spec-state[Frozen state]
 ====
-Assume anything could still change, but limited change should be expected.
+Change is extremely unlikely. A high threshold will be used, and a change will only occur because of some truly critical issue being identified during the public review cycle. Any other desired or needed changes can be the subject of a follow-on new extension.
 ====
 
 [preface]