Fix link to Javadoc API

See spring-projectsgh-27151

src/docs/asciidoc/core/core-validation.adoc

@@ -215,7 +215,7 @@ as the following example shows:
 Validation errors are reported to the `Errors` object passed to the validator. In the case
 of Spring Web MVC, you can use the `<spring:bind/>` tag to inspect the error messages, but
 you can also inspect the `Errors` object yourself. More information about the
-methods it offers can be found in the {api-spring-framework}validation/Errors.html[javadoc].
+methods it offers can be found in the {api-spring-framework}/validation/Errors.html[javadoc].