[docs][api] add documentation for generate key behaviour

Signed-off-by: Benjamin Grolleau <benjamin.grolleau@outlook.com>

Author: Grolleau-Benjamin

api/stse_asymmetric_keys_management.h

@@ -79,7 +79,8 @@ stse_ReturnCode_t stse_get_ecc_key_slot_info(
 
 /**
  * \brief 		Generate an ECDHE key pair
- * \details 	This API request STSE to generate an ECDHE key pair
+ * \details 	This API request STSE to generate an ECDHE key pair.
+ * If the slot is already seeded, it will be overwritten with the new key
  * \param[in] 	pSTSE 			Pointer to STSE Handler
  * \param[in] 	key_type 		Key type to generate
  * \param[out] 	pPublic_key 	Public key of the generated key pair
@@ -93,7 +94,8 @@ stse_ReturnCode_t stse_generate_ECDHE_key_pair(
 
 /**
  * \brief 		Generate an ECC key pair
- * \details 	This API request STSE to generate an ECC key pair in the private key table
+ * \details     This API requests the STSE to generate an ECC key pair in the private key table.
+ * If the slot is already seeded, it will be overwritten with the new key
  * \param[in] 	pSTSE 			Pointer to STSE Handler
  * \param[in] 	slot_number 	Private key table slot used to generate the key pair
  * \param[in] 	key_type 		Key pair type