Document JSP limitation: error page customization

Closes gh-2893

Author: bclozel

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -1971,6 +1971,9 @@ packaged as an executable archive), there are some limitations in the JSP suppor
 
 * Undertow does not support JSPs.
 
+* Creating a custom `error.jsp` page won't override the default view for
+<<boot-features-error-handling,error handling>>.
+
 There is a {github-code}/spring-boot-samples/spring-boot-sample-web-jsp[JSP sample] so you
 can see how to set things up.