Add link to Samba, link to settings option

docs/topics/file_storage.rst

@@ -2,7 +2,7 @@
 File storage
 ============
 
-The files are stored and placed under Mayan EDMS "control" to avoid
+The files are stored and placed under **Mayan EDMS** "control" to avoid
 filename clashes (each file gets renamed to its UUID and with an extension)
 and stored in a simple flat arrangement in a directory.  This doesn't
 stop access to the files but it is not recommended because moving,
@@ -12,14 +12,19 @@ index which would create a directory tree like structure in the database
 and then turn on the index filesystem mirror options which would create
 an actual directory tree and links to the actual stored files but using
 the filename of the documents as stored in the database.  This
-filesystem mirror of the index can them be shared with Samba across the
+filesystem mirror of the index can them be shared with Samba_ across the
 network.  This access would be read-only, and new versions of the files
 would have to be uploaded from the web GUI using the new document
 versioning support.
 
-Mayan's EDMS components are as decoupled from each other as possible,
+**Mayan EDMS** components are as decoupled from each other as possible,
 storage in this case is very decoupled and its behavior is controlled
 not by the project but by the Storage progamming class.  Why this design?
 All the other part don't make any assumptions about the actual file
-storage, so that Mayan EDMS can work saving files locally, over the
+storage, so that **Mayan EDMS** can work saving files locally, over the
 network or even across the internet and still operate exactly the same.
+
+The file storage behavior is controlled by the :setting:`DOCUMENTS_STORAGE_BACKEND`
+and should be set to a class or subclass of Django's ``django.core.files.storage.FileSystemStorage`` class.
+
+.. _Samba: http://www.samba.org/