Update index.bs

Co-authored-by: Emil Lundberg <emil@yubico.com>

index.bs

@@ -4758,7 +4758,7 @@ the requested [=public key credential|credential=] is [=scoped=] to exactly matc
     possibly combined in a single [=authorization gesture=],
     then the authenticator will set both the [=UP=] [=flag=] and the [=authData/flags/UV=] [=flag=].
 
-- The [=BE=] [=flag=] SHALL be set if and only if a credential is a [=multi-device credential=]. 
+- The [=BE=] [=flag=] SHALL be set if and only if the credential is a [=multi-device credential=]. 
     This value MUST NOT change after a [=registration ceremony=] as defined in [[#sctn-credential-backup]].
 
 - The [=BS=] [=flag=] SHALL be set if and only if the credential is a [=multi-device credential=] and is currently [=backed up=].