SLING-6827 add doc link

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1793722 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/sling/jcr/contentparser/ContentType.java b/src/main/java/org/apache/sling/jcr/contentparser/ContentType.java
index 7b0f875..21d7e14 100644
--- a/src/main/java/org/apache/sling/jcr/contentparser/ContentType.java
+++ b/src/main/java/org/apache/sling/jcr/contentparser/ContentType.java
@@ -27,7 +27,8 @@
 public enum ContentType {
 
     /**
-     * JSON content.
+     * JSON content descriptor file.
+     * @see https://sling.apache.org/documentation/bundles/content-loading-jcr-contentloader.html#json-descriptor-files
      */
     JSON("json"),