Fix typo

See gh-15642

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/source/InvalidConfigurationPropertyValueException.java

@@ -39,7 +39,7 @@ public class InvalidConfigurationPropertyValueException extends RuntimeException
 	 * @param name the name of the property in canonical format
 	 * @param value the value of the property, can be {@code null}
 	 * @param reason a human-readable text that describes why the reason is invalid.
-	 * Starts with an upper-case and ends with a dots. Several sentences and carriage
+	 * Starts with an upper-case and ends with a dot. Several sentences and carriage
 	 * returns are allowed.
 	 */
 	public InvalidConfigurationPropertyValueException(String name, Object value,