[chore] fix type of registry groups (#957)

Co-authored-by: Liudmila Molkova <limolkova@microsoft.com>

model/registry/aws.yaml

@@ -315,7 +315,7 @@ groups:
         examples: ["8", "26"]
   - id: registry.aws.eks
     prefix: aws.eks
-    type: resource
+    type: attribute_group
     brief: >
       This document defines attributes for AWS Elastic Kubernetes Service (EKS).
     attributes:

model/registry/otel.yaml

@@ -25,7 +25,7 @@ groups:
         stability: stable
   - id: registry.otel.scope
     prefix: otel.scope
-    type: resource
+    type: attribute_group
     brief: Attributes used by non-OTLP exporters to represent OpenTelemetry Scope's concepts.
     attributes:
       - id: name

model/registry/peer.yaml

@@ -1,6 +1,6 @@
 groups:
   - id: registry.peer
-    type: span
+    type: attribute_group
     prefix: peer
     brief: >
       Operations that access some remote service.