The SBI v2.0 is ratified now. Update the change log and document state

Signed-off-by: Atish Patra <[email protected]>

riscv-sbi.adoc

@@ -4,7 +4,7 @@
 :company: RISC-V.org
 // Pull in variable with revision info
 include::autogenerated/revision.adoc-snippet[]
-:revremark: This document is Frozen. 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. Visit http://riscv.org/spec-state for further details.
+:revremark: This document is Ratified. No changes are allowed. Any desired or needed changes can be the subject of a follow-on new extension. Ratified extensions are never revised. Visit http://riscv.org/spec-state for further details.
 :url-riscv: http://riscv.org
 :doctype: book
 :preface-title: Preamble
@@ -38,12 +38,9 @@ endif::[]
 
 // Preamble
 [WARNING]
-.This document is in the link:http://riscv.org/spec-state[Frozen state]
+.This document is in the link:http://riscv.org/spec-state[Ratified state]
 ====
-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.
+No changes are allowed. Any desired or needed changes can be the subject of a follow-on new extension. Ratified extensions are never revised
 
 ====
 

src/changelog.adoc

@@ -1,5 +1,10 @@
 == Change Log
 
+=== Version 2.0
+* Clarification around SBI PMU set memory function
+* Base extension function name typo fix
+* Upate the document state to Ratified
+
 === Version 2.0-rc8
 * Clarfications STA extension and counter index in the pmu snapshot.