chore: fix typos in src/main/java/com/thealgorithms/strings/Pangram.java (#7044)

Fix typos in src/main/java/com/thealgorithms/strings/Pangram.java

Co-authored-by: a 19151554+alxkm@users.noreply.github.com

Author: Lê Nam Khánh

src/main/java/com/thealgorithms/strings/Pangram.java

@@ -60,7 +60,7 @@ public static boolean isPangram(String s) {
     }
 
     /**
-     * Checks if a String is Pangram or not by checking if each alhpabet is present or not
+     * Checks if a String is Pangram or not by checking if each alphabet is present or not
      *
      * @param s The String to check
      * @return {@code true} if s is a Pangram, otherwise {@code false}