[software catalog] Update entity version documentation

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-07-09 16:50:36.830016",
-            "spec_repo_commit": "d0906173"
+            "regenerated": "2025-07-09 18:06:41.625080",
+            "spec_repo_commit": "c5b3557c"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-07-09 16:50:46.124503",
-            "spec_repo_commit": "d0906173"
+            "regenerated": "2025-07-09 18:06:50.885571",
+            "spec_repo_commit": "c5b3557c"
         }
     }
 }

data/api/v2/full_spec.yaml

@@ -13498,14 +13498,21 @@ components:
           type: string
       type: object
     EntityV3APIVersion:
-      description: The schema version of entity type. The field is known as schema-version
-        in the previous version.
+      description: The version of the schema data that was used to populate this entity's
+        data. This could be via the API, Terraform, or YAML file in a repository.
+        The field is known as schema-version in the previous version.
       enum:
       - v3
+      - v2.2
+      - v2.1
+      - v2
       example: v3
       type: string
       x-enum-varnames:
       - V3
+      - V2_2
+      - V2_1
+      - V2
     EntityV3DatadogCodeLocationItem:
       additionalProperties: false
       description: Code location item.