docs(frontback): fixed subject

subjects/frontback/README.md

@@ -3,10 +3,10 @@
 ### Instructions
 
 Write a program that prints the previous letter and the next letter of the Latin alphabet.
-- If the number of arguments is different from 1, print (`'\n'`).
-- If the length of the argument is different from 1, print (`'\n'`)
-- If the argument is not a letter, print (`'\n'`)
-- There are no letters to print before 'a' or after 'z'.
+- If the number of arguments is different from `1`, print a new line `\n`.
+- If the length of the argument is different from `1`, print a new line `\n`.
+- If the argument is not a letter, print a new line `\n`.
+- There are no letters to print before `a` or after `z`.
 
 ### Usage