docs(digitlen):fix readme

subjects/digitlen/README.md

@@ -4,7 +4,7 @@
 
 Write a function `DigitLen()` that takes two integers as arguments and returns the times the first `int` can be divided by the second until it reaches zero.
 
-- The second `int` must be between ***2*** and ***36***. If not, the function returns `-1`.
+- The second `int` must be between **_2_** and **_36_**. If not, the function returns `-1`.
 - If the first `int` is negative, reverse the sign and count the digits.
 
 ### Expected function
@@ -39,8 +39,8 @@ And its output:
 
 ```console
 $ go run . | cat -e
-3
+3$
-7
+7$
-2
+2$
--1
+-1$
 ```