feat: use the same private constructor comment within the whole repository

num4j/src/main/java/com/onixbyte/nums/PercentileCalculator.java

@@ -54,7 +54,7 @@ public final class PercentileCalculator {
     private final static Logger log = LoggerFactory.getLogger(PercentileCalculator.class);
 
     /**
-     * Private constructor prevents from being initialised.
+     * Private constructor to prevent instantiation of this utility class.
      */
     private PercentileCalculator() {
     }

num4j/src/main/java/com/onixbyte/nums/model/QuartileBounds.java

@@ -86,8 +86,7 @@ public record QuartileBounds(
         private Double lowerBound;
 
         /**
-         * Private constructor for {@code Builder}, ensuring it can only be instantiated through the
-         * {@link QuartileBounds#builder()} method.
+         * Private constructor to prevent instantiation of this utility class.
          */
         private Builder() {
         }