docs: fixing test example and adding more information to clarify

subjects/java/checkpoints/almost-palindrom/README.md

@@ -1,10 +1,12 @@
-## Palindrome
+## AlmostPalindrome
 
 ### Instructions
 
 In a file named `AlmostPalindrome.java` write a function `isAlmostPalindrome` that returns true if the String in parameter is almost palindrome.
 A word is considered "almost a palindrome" if removing one letter from the word makes it a palindrome.
 
+> 💡 The String in parametre will contains at least 3 letters.
+
 ### Expected Functions
 
 ```java
@@ -22,7 +24,7 @@ Here is a possible `ExerciseRunner.java` to test your function :
 ```java
 public class ExerciseRunner {
     public static void main(String[] args) {
-        System.out.println(AlmostPalindrome.isAlmostPalindrome("reviver"));
+        System.out.println(AlmostPalindrome.isAlmostPalindrome("Racedcar"));
         System.out.println(AlmostPalindrome.isAlmostPalindrome("level"));
     }
 }