Improve TCP flags doc (#449)

Author: jotak

web/src/api/ipfix.ts

@@ -95,7 +95,7 @@ export interface Fields {
   Interface?: string;
   /** Flow direction from the network interface observation point */
   IfDirection?: InterfaceDirection;
-  /** TCP flags */
+  /** Logical OR combination of unique TCP flags comprised in the flow, as per RFC-9293, with additional custom flags to represent the following per-packet combinations: SYN+ACK (0x100), FIN+ACK (0x200) and RST+ACK (0x400). */
   Flags?: number;
   /** Number of packets */
   Packets?: number;