Update SBNYoungIndex.md

Author: mking99456

SBNYoung/SBNYoungIndex.md

@@ -46,6 +46,10 @@ Thanks to the authors of the SBND & ICARUS Newbie Guides from which we ported so
 - [Key Physics Concepts](Physics_Concepts.md)  
   *LArTPC operation, descriptions of PDS and CRT, motivation for short baseline, etc*
 
+## Documentation
+- [SBN DocDB](DocDB.md)
+  *All of our presentations, tech notes, plots, and other documents are stored on the SBN DocDB. What is it?*
+
 ## Production Samples ##
 - [Available Samples](Samples_List.md)
   *A list of available sample samweb definitions and instructions on how to access those samples*