Removing note about SidecarGeneratedBy

Author: bclenet

src/modality-agnostic-files/provenance.md

@@ -336,11 +336,6 @@ and a guide for using macros can be found at
    }
 ) }}
 
-!!! note
-    Not defining the `SidecarGeneratedBy` field means that the sidecar JSON was generated by the same activity as the data file itself and described in the `GenearatedBy` field.
-
-    `SidecarGeneratedBy` MUST explicitly include all activities that modified the sidecar JSON, even if some are already listed in `GeneratedBy`.
-
 !!! example "Example of metadata in a sidecar JSON file"
     ```JSON
     {

src/schema/objects/metadata.yaml

@@ -1298,6 +1298,7 @@ Entities:
           - type: string
             format: uri
           - type: array
+            minItems: 2
             items:
               type: string
               format: uri
@@ -1588,6 +1589,7 @@ GeneratedById:
     - type: string
       format: uri
     - type: array
+      minItems: 2
       items:
         type: string
         format: uri