Update index.asciidoc
diff --git a/netbeans.apache.org/src/content/download/nb112/index.asciidoc b/netbeans.apache.org/src/content/download/nb112/index.asciidoc
index 5dd841d..95ff367 100644
--- a/netbeans.apache.org/src/content/download/nb112/index.asciidoc
+++ b/netbeans.apache.org/src/content/download/nb112/index.asciidoc
@@ -56,7 +56,7 @@
image::jdk13-textblock.png[role="left", link="jdk13-textblock.png"]
--
-TIP: link:https://openjdk.java.net/jeps/12[JEP 12] provides for a preview language or VM feature, which "is a new feature of the Java SE Platform that is fully specified, fully implemented, and yet impermanent. It is available in a JDK feature release to provoke developer feedback based on real world use; this may lead to it becoming permanent in a future Java SE Platform.
+TIP: link:https://openjdk.java.net/jeps/12[JEP 12] provides for a preview language or VM feature, which "is a new feature of the Java SE Platform that is fully specified, fully implemented, and yet impermanent. It is available in a JDK feature release to provoke developer feedback based on real world use; this may lead to it becoming permanent in a future Java SE Platform".
Preview features can only be used if the Java compiler's "--enable-preview" flag is set, as shown below for Maven.
