Style and wording fixes

lab2/lab2_demo_btn_read/lab2_demo_btn_read.ino

@@ -4,10 +4,10 @@ const int tickDelay = 100;
 
 
 void setup() 
 void setup() 
 {
 {
-  // Alustame jadaühenduse
+  // Seadistame jadaühenduse
   Serial.begin(9600);
   Serial.begin(9600);
 
 
-  // Määrame nupu sisendiks
+  // Seadistame surunupu sisendina
   pinMode(BTN_PIN, INPUT);
   pinMode(BTN_PIN, INPUT);
 }
 }