📝 Clarify JSON-to-XDR type requirement

Co-authored-by: Codex <noreply@openai.com>

Author: JFWooten4

docs/tools/lab/view-xdr/json-to-xdr.mdx

@@ -9,7 +9,7 @@ sidebar_position: 1
 
 :::info[Encode for Stellar]
 
-Input must follow the XDR-JSON schema so the converter can reconstruct the original Stellar XDR types. Learn more in the [XDR-JSON section](../../../learn/fundamentals/data-format/xdr-json.mdx).
+Input must follow the XDR-JSON schema and be paired with the correct selected XDR type, because the JSON does not identify its top-level type. Learn more in the [XDR-JSON section](../../../learn/fundamentals/data-format/xdr-json.mdx).
 
 :::