Make Period JavaDoc consistent with Duration.

Author: OrangeDog

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodToStringConverter.java

@@ -32,7 +32,8 @@
  * @author Eddú Meléndez
  * @author Edson Chávez
  * @since 2.3.0
- * @see Period
+ * @see PeriodFormat
+ * @see PeriodUnit
  */
 public class PeriodToStringConverter implements GenericConverter {
 

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/StringToPeriodConverter.java

@@ -33,6 +33,7 @@
  * @author Eddú Meléndez
  * @author Edson Chávez
  * @since 2.3.0
+ * @see PeriodFormat
  * @see PeriodUnit
  */
 public class StringToPeriodConverter implements GenericConverter {