docs(link): to https://github.com/fugerit79/venus-sample-custom-fop-type-handler repo

Author: fugerit79

fj-doc-guide/src/main/docs/asciidoc/chapters/00_4_useful_resources.adoc

@@ -12,4 +12,8 @@ link:include::chapters/https://docs.fugerit.org/fj-doc-playground/home/[https://
 ==== Mongo DB Json Data Source Example
 
 The link:https://github.com/fugerit79/venus-sample-mongodb-ds[About
-Venus Fugerit Doc sample using a MongoDB data source] is a simple project showing how is possible to load the data model from a Mongo DB Collection and setting it directly as JSON.
+Venus Fugerit Doc sample using a MongoDB data source] is a simple project showing how is possible to load the data model from a Mongo DB Collection and setting it directly as JSON.
+
+==== Mongo DB Json Data Source Example
+
+The link:https://github.com/fugerit79/venus-sample-custom-fop-type-handler[Venus Fugerit Doc Sample project implementing a Custom Apache FOP type handler] shows how is it possible to customize doc handlers behaviors.

fj-doc-guide/src/main/docs/asciidoc/chapters/07_009-extending-handler-capabilities.adoc

@@ -51,3 +51,4 @@ Now, by the default accessibility is off, but we can turn on just adding the sys
 
 To our environment.
 
+Another example can be found on the sample project link:https://github.com/fugerit79/venus-sample-custom-fop-type-handler[Venus Fugerit Doc Sample project implementing a Custom Apache FOP type handler] shows how is it possible to customize doc handlers behaviors.