Editorial change in Wallet Solution 'alg' HEADER

docs/en/wallet-solution.rst

@@ -88,7 +88,7 @@ Header
 +---------+-----------------------------------------------------------------+
 | **Key** | **Value**                                                       |
 +---------+-----------------------------------------------------------------+
-| alg     | Algorithm used to verify the token signature (e.g., ES256).     |
+| alg     | Algorithm used to verify the token signature. It MUST be one of the possibile values indicated `here <https://italia.github.io/eudi-wallet-it-docs/versione-corrente/en/algorithms.html>`_ (e.g., ES256).|
 +---------+-----------------------------------------------------------------+
 | kid     | Thumbprint of the public key used for signing.                  |
 +---------+-----------------------------------------------------------------+