Retain issue body to allow file attachments

.github/ISSUE_TEMPLATE/documentation_change.yaml

@@ -2,7 +2,6 @@
 name: 📖 Documentation Change
 about: Suggest an addition or modification to the NetBox documentation
 labels: ["type: documentation"]
-issue_body: false
 body:
   - type: dropdown
     attributes:
@@ -32,3 +31,7 @@ body:
       description: "Describe the proposed changes and why they are necessary"
     validations:
       required: true
+  - type: markdown
+    attributes:
+      value: "### Additional information
+      You can use the space below to provide any additional information or to attach files."