Merge pull request #2377 from HardenedSteel/guide

how to prove payment: replace outdated screenshots

_i18n/en/resources/user-guides/prove-payment.md

@@ -39,7 +39,7 @@ If it's set to 0, set it to 1:
 
 Alice can open her monero-wallet-gui and go to the history page to see her transaction detail:
 
-![History](/img/resources/user-guides/en/prove-payment/history.png)
+![History](/img/resources/user-guides/en/prove-payment/history.avif)
 
 Here, she can copy the transaction ID and Bob's address by clicking on each of them.
 Then she can click on `P` to get a payment proof (transaction key):
@@ -73,7 +73,8 @@ Obviously, Charlie will want to double check with Bob the address is really his
 
 Charlie will open his monero-wallet-gui and go to the Advanced > Prove/Check page to fill the Check section with the informations provided by Alice:
 
-![Check payment](/img/resources/user-guides/en/prove-payment/check-payment.png)
+![Check payment-1](/img/resources/user-guides/en/prove-payment/check-payment-1.avif)
+![Check payment-2](/img/resources/user-guides/en/prove-payment/check-payment-2.avif)
 
 Then clicking on Check will tell Charlie how much this particular transaction sent to this address, and how much confirmation the transaction had: