Updated Frequently asked Questions Common Questions (markdown)

Frequently-asked-Questions--Common-Questions.md

@@ -21,8 +21,8 @@ Raylib has no built in timer system. You are expected to keep track of time in y
 ```c
 typedef struct 
 {
-    double StartTime;
-    double Lifetime;
+    double StartTime;   // start time (seconds)
+    double Lifetime;    // lifetime (seconds)
 }Timer;
 
 void StartTimer(Timer* timer, double lifetime)