fix(docs): faq for accessibility

Author: fugerit79

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

@@ -9,11 +9,15 @@ The online playground where you can try Fugerit Venus Doc features :
 
 link:include::chapters/https://docs.fugerit.org/fj-doc-playground/home/[https://docs.fugerit.org/fj-doc-playground/home/]
 
+[#doc-res-link-sample-index]
+==== Venus Fugerit Doc sample index
+
+The link:https://github.com/fugerit79/venus-sample-index[Venus Fugerit Doc sample index] contains an index of some sample tutorials on specific features.
+
 [#doc-res-link-mongo-ds]
 ==== 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.
+The link:https://github.com/fugerit79/venus-sample-mongodb-ds[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.
 
 [#doc-res-link-extend-type-handler]
 ==== Extending a Type Handler with custom behaviours
@@ -29,3 +33,8 @@ The link:https://github.com/fugerit79/venus-sample-validating-source[Venus Fuger
 ==== Cleaning an XML source
 
 The link:https://github.com/fugerit79/venus-sample-clean-source[Venus Fugerit Doc sample showing ability to clean source XML] this can be useful when facing error like _An invalid XML character (Unicode: 0x2) was found in the element content of the document_.
+
+[#doc-res-link-pdf-fop-accessibility]
+==== PDF/UA-1 accessibility for PDF
+
+The link:https://github.com/fugerit79/venus-sample-pdf-fop-accessibility[Venus Fugerit Doc sample showing how to use accessibility features of PDF FOP type handler], additionally contains info on PDF/A format support and output file size comparison.