Merge pull request #2239 from selfissued/mbj-tokenBinding-RESERVED

Say that tokenBinding is RESERVED in History

index.bs

@@ -9849,7 +9849,7 @@ for their contributions as our W3C Team Contacts.
 
 [INFORMATIVE]
 
-This section contains the substantive changes that have been made to this specification over time.
+This section summarizes the significant changes that have been made to this specification over time.
 
 ## Changes since Web Authentication Level 2 [[webauthn-2-20210408]] ## {#changes-since-l2}
 
@@ -9871,6 +9871,7 @@ Deprecations:
     <code>{{CredentialCreationOptions/publicKey}}.{{PublicKeyCredentialCreationOptions/rp}}.{{PublicKeyCredentialEntity/name}}</code>:
     [[#dictionary-pkcredentialentity]]
 - [[#sctn-android-safetynet-attestation]]
+- [=CollectedClientData/tokenBinding=] was changed to \[RESERVED].
 
 
 New features: