Address #1551 - better timers handling

docs/README.md

@@ -1951,11 +1951,12 @@ struct mg_timer {
   uint64_t period_ms;       // Timer period in milliseconds
   uint64_t expire;          // Expiration timestamp in milliseconds
   unsigned flags;           // Possible flags values below
-#define MG_TIMER_REPEAT 1   // Call function periodically, otherwise run once
+#define MG_TIMER_ONCE 0     // Call function once
+#define MG_TIMER_REPEAT 1   // Call function periodically
 #define MG_TIMER_RUN_NOW 2  // Call immediately when timer is set
   void (*fn)(void *);       // Function to call
   void *arg;                // Function argument
-  struct mg_timer *next;    // Linkage in g_timers list
+  struct mg_timer *next;    // Linkage
 };
 ```