Merge pull request #3768 from kant/patch-5

Grammatical issues (minor fixes)

Author: bakercp

docs/serial.md

@@ -11,5 +11,5 @@ Get it to work
 
 2. Setup the arduino with an LED on pin 13 and get the blinking LED example to work. 
 2. Then upload this code. 
-3. Open the serial monitor and type the letter a.  It something takes 5-15 seconds to for serial i/o to respond.  You should see an LED blink and the letters ABC in the console. 
-4. Then, close the monitor, take note of the port number (ie, `COM7`) and then compile the serial example, changing the com port to the right value. 
+3. Open the serial monitor and type the letter a.  It takes 5-15 seconds for serial i/o to respond.  You should see an LED blink and the letters ABC in the console. 
+4. Then, close the monitor, take note of the port number (ie, `COM7`) and then compile the serial example, changing the com port to the right value.