Apply suggestions from code review

Co-authored-by: Irit Arkin <irit.arkin@arm.com>

Author: LDong-Arm

docs/program-setup/serial/serial_communication.md

@@ -76,7 +76,7 @@ mbed compile -t <TOOLCHAIN> -m <TARGET> --flash --sterm
 
 ## Additional examples - reading user inputs
 
-In addition to printing messages, Mbed OS applications can also read keyboard inputs from the user. This is achievable with the [BufferedSerial](../apis/bufferedserial.html) and [UnbufferedSerial](../apis/unbufferedserial.html) classes.
+In addition to printing messages, Mbed OS applications can also read keyboard inputs from the user using the [BufferedSerial](../apis/bufferedserial.html) and [UnbufferedSerial](../apis/unbufferedserial.html) classes.
 
 Use your terminal application to interact with the following examples.
 

docs/tools/debug/debug_with_printf.md

@@ -1,10 +1,10 @@
 # Debugging using printf() statements
 
-An easy way to inspect what your application is doing is to augment your application with `printf()` statements. In Arm Mbed, you can use a serial connection to send feedback from your development board back to your computer.
+An easy way to inspect what your application is doing is to augment your application with `printf()` statements. In Mbed OS, you can use a serial connection to send feedback from your development board back to your computer.
 
 ## Prerequisites
 
-For a tutorial on setting up serial communication, see [Board to PC communication over USB](tutorials/serial-comm.html).
+For a tutorial on setting up serial communication, see [Board to PC communication over USB](../program-setup/serial-communication.html).
 
 ## Printf()