Added default type description to Accounts Get Operation.

Added null check to sort.Desc to AccountRepository.cs

Tzkt.Api/Controllers/AccountsController.cs

@@ -205,7 +205,7 @@ public Task<Account> GetByAddress([Address] string address, bool metadata = fals
         /// because all these types have an `initiator` field.
         /// </remarks>
         /// <param name="address">Account address (starting with tz or KT)</param>
-        /// <param name="type">Comma separated list of operation types to return (endorsement, ballot, proposal, activation, double_baking, double_endorsing, nonce_revelation, delegation, origination, transaction, reveal, migration, revelation_penalty, baking)</param>
+        /// <param name="type">Comma separated list of operation types to return (`endorsement`, `ballot`, `proposal`, `activation`, `double_baking`, `double_endorsing`, `nonce_revelation`, `delegation`, `origination`, `transaction`, `reveal`, `migration`, `revelation_penalty`, `baking`). If not specified then all operation types except `endorsement` and `baking` will be returned.</param>
         /// <param name="initiator">Filters transactions, delegations and originations by initiator. Allowed fields for `.eqx` mode: none.</param>
         /// <param name="sender">Filters transactions, delegations, originations, reveals and seed nonce revelations by sender. Allowed fields for `.eqx` mode: none.</param>
         /// <param name="target">Filters transactions by target. Allowed fields for `.eqx` mode: none.</param>

Tzkt.Api/Repositories/AccountRepository.cs

@@ -2424,7 +2424,7 @@ OFFSET      @offset
                     break;
             }
 
-            return sort.Desc == null
+            return sort?.Desc == null
                 ? result.OrderBy(x => x.Id).Take(limit)
                 : result.OrderByDescending(x => x.Id).Take(limit);
         }