flow: improve Flow field docs

src/flow.h

@@ -366,7 +366,7 @@ typedef struct Flow_
             uint8_t code;   /**< icmp code */
         } icmp_d;
     };
-    uint8_t proto;
+    uint8_t proto; /**< ip proto of the flow */
     uint8_t recursion_level;
     uint16_t vlan_id[VLAN_MAX_LAYERS];
 
@@ -395,7 +395,7 @@ typedef struct Flow_
      *  Ignored in emergency mode. */
     uint32_t timeout_policy;
 
-    /* time stamp of last update (last packet). Set/updated under the
+    /** time stamp of last update (last packet). Set/updated under the
      *  flow and flow hash row locks, safe to read under either the
      *  flow lock or flow hash row lock. */
     SCTime_t lastts;