fix: grep6 - files with dr dialogue

Author: RaihanSharif

individual-shell-tools/grep/script-06.sh

@@ -4,4 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the name of every `.txt` file in this directory which contains a line of dialogue said by the Doctor.
 # The output should contain two filenames.
-grep -Rl '^Doctor:'
+grep -Rl '^Doctor:' *txt