Update index.bs

emlun's suggestion to change the `it` to be explicit.

Co-authored-by: Emil Lundberg <emil@emlun.se>

index.bs

@@ -8277,13 +8277,13 @@ The [=remote end steps=] are:
  1. Let |credential| be the [=public key credential source=] managed by |authenticator| matched by |credentialId|.
  1. If |credential| is empty, return a [=WebDriver error=] with [=WebDriver error code=] [=invalid argument=].
  1. Let |backupEligibility| be the |parameters|' |backupEligibility| property.
- 1. If |backupEligibility| is defined, set the [=backup eligibility=] [=credential property=] of |credential| to its value.
+ 1. If |backupEligibility| is defined, set the [=backup eligibility=] [=credential property=] of |credential| to the value of |backupEligibility|.
 
     Note: Normally, the |backupEligibility| property is permanent to a [=public key credential source=].
     [=Set Credential Properties=] allows changing it for testing and debugging purposes.
 
  1. Let |backupState| be the |parameters|' |backupState| property.
- 1. If |backupState| is defined, set the [=backup state=] [=credential property=] of |credential| to its value.
+ 1. If |backupState| is defined, set the [=backup state=] [=credential property=] of |credential| to the value of |backupState|.
  1. Return [=success=].
 
 # IANA Considerations # {#sctn-IANA}