docs: Improve wording for KMP helper method

Author: 4ndrelim

src/main/java/algorithms/patternFinding/KMP.java

@@ -42,8 +42,8 @@
  */
 public class KMP {
     /**
-     * Captures the longest prefix which is also a suffix for every substring starting at index 0. Does this
-     * by tracking the number of characters (of the prefix and suffix) matched.
+     * Captures the longest prefix which is also a suffix for some substring ending at each index, starting from 0.
+     * Does this by tracking the number of characters (of the prefix and suffix) matched.
      *
      * @param pattern to search
      * @return an array of indices