DOC: Made the documentation for WaitForIt() more explicit.

include/caosdb/transaction.h

@@ -345,7 +345,8 @@ public:
    *
    * A client may request the current status at any time via GetStatus().
    *
-   * Use WaitForIt() to join the back-ground execution of this transaction.
+   * Use WaitForIt() to join the back-ground execution of this transaction, otherwise the behaviour
+   * of getting the ResultSet is undefined.
    */
   auto ExecuteAsynchronously() noexcept -> StatusCode;
 
@@ -353,7 +354,8 @@ public:
    * Join the background execution and return the status when the execution
    * terminates.
    *
-   * Use this after ExecuteAsynchronously().
+   * Use this after ExecuteAsynchronously(), otherwise the TransactionStatus still remains
+   * EXECUTING.
    */
   [[nodiscard]] auto WaitForIt() const noexcept -> TransactionStatus;