Added commands 'lsof -i :<PORT>' and 'kill <PID>' (#18782)

Added command which helps to detect process which is using the port you want to use, and command which terminates a process with process ID you found using the previous command

client/src/pages/guide/english/terminal-commandline/macos-terminal/index.md

@@ -68,6 +68,12 @@ Use the following syntax to delete a file
 
 **rm _#PATH_TO_FILE_**
 
+#### Detect which process is using the port you want to use
+``` lsof -i :<PORT> ```
+
+#### Terminate the process which uses the port you want to use
+``` kill <PID> ```
+
 # iTerm2
 
 iTerm2 is an alternative to the legacy terminal in Mac OS. iTerm2 brings some new features such as: