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

simple-jwt-facade/src/main/java/com/onixbyte/simplejwt/SecretCreator.java

@@ -128,7 +128,7 @@ public final class SecretCreator {
     }
 
     /**
-     * Private constructor will protect this class from being instantiated.
+     * Private constructor to prevent instantiation of this utility class.
      */
     private SecretCreator() {
     }

simple-jwt-facade/src/main/java/com/onixbyte/simplejwt/constants/PredefinedKeys.java

@@ -90,7 +90,7 @@ public final class PredefinedKeys {
             List.of(ISSUER, SUBJECT, AUDIENCE, EXPIRATION_TIME, NOT_BEFORE, ISSUED_AT, JWT_ID);
 
     /**
-     * Private constructor will protect this class from being instantiated.
+     * Private constructor to prevent instantiation of this utility class.
      */
     private PredefinedKeys() {
     }