Update documenation of PSA_ALG_RSA_PSS
* This is the signature scheme defined by RFC 8017
* (PKCS#1: RSA Cryptography Specifications) under the name
* RSASSA-PSS, with the message generation function MGF1, and with
- * a salt length equal to the length of the hash. The specified
- * hash algorithm is used to hash the input message, to create the
- * salted hash, and for the mask generation.
+ * a salt length equal to the length of the hash, or the largest
+ * possible salt length for the algorithm and key size if that is
+ * smaller than the hash length. The specified hash algorithm is
+ * used to hash the input message, to create the salted hash, and
+ * for the mask generation.
*
* \param hash_alg A hash algorithm (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_HASH(\p hash_alg) is true).
