fixing typo mistake

Author: sheida-shab

individual-shell-tools/grep/script-03.sh

@@ -4,4 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the number of lines in dialogue.txt that contain the word Doctor (regardless of case).
 # The output should be exactly the number 9.
-rep -ic Doctor dialogue.txt 
+grep -ic Doctor dialogue.txt