Fix small issues

This MR fixes some small issues:

• Fix date format in release notes
• Fix some REF_NOT_FOUND with newer Hugo

Those were detected while playing with newer hugo (!673 (merged)) that makes them fatal errors.

content/architecture/application/data_sharing.md

@@ -22,12 +22,12 @@ one or more ***consumers*** receive information from one or more
 
 ## Use cases
 
-- [Points of interest]( {{< ref "/points_of_interest.md" >}} ) should use one
+- [Points of interest]( {{< ref "points_of_interest.md" >}} ) should use one
   of these patterns
-- [Sharing]( {{< ref "/sharing.md" >}} ) could use one of these patterns
+- [Sharing]( {{< ref "sharing.md" >}} ) could use one of these patterns
 - Global search (see [ConceptDesigns]( {{< ref "global-search.md" >}} ))
   currently carries out the equivalent of
-  [interface discovery]( {{< ref "/interface_discovery.md" >}} ) by
+  [interface discovery]( {{< ref "interface_discovery.md" >}} ) by
   reading the manifest directly, but other than that it is similar to
   [Query-based access via D-Bus](#query-based-access-via-d-bus)
 
@@ -62,7 +62,7 @@ consumers and among providers.
 ## Discovery
 
 Each initiator carries out [Interface
-discovery]( {{< ref "/interface_discovery.md" >}} ) to find implementations of
+discovery]( {{< ref "interface_discovery.md" >}} ) to find implementations of
 the responder. If the initiator is the consumer, the interface that is
 discovered might have a name like
 `com.example.PointsOfInterestProvider`. If the initiator is the
@@ -374,7 +374,7 @@ If the system is restarted and the previously running applications are
 restored, and the interface is one where resuming communication makes
 sense, we recommend that the original initiator re-initiates
 communication. This would normally be done by repeating [interface
-discovery]( {{< ref "/interface_discovery.md" >}} ).
+discovery]( {{< ref "interface_discovery.md" >}} ).
 
 In a few situations it might be preferable for the original initiator to
 store a list of the responders with which it was previously