Clarify file splitting on export (#1738)

Author: andrew-3

app/views/pages/developer-guide/data-import-export/export.liquid

@@ -13,6 +13,7 @@ platformOS CLI provides the `pos-cli data export --zip` command. Options:
 
 - --path (short: -p): A file path to a JSON file which will be created by the CLI and where the exported data is stored.
 - --export-internal-ids: By default, export will use the autogenerated `external_id` for the `id` field. When this option is set, it will use the normal `id` from the object.
+- Note that records files will be split into multiple files if they exceed 10,000 records. For example, if you have 20,000 users, you will get 2 files: `users.0.csv` and `users.1.csv`.
 
 Under the hood, the CLI uses the export API that's described in the next section. However, using the CLI provides some major benefits:
 
@@ -52,6 +53,7 @@ mutation create_data_export(
 ```
 
 Please note that you can specify the filters, that will be taken into consideration and only data matching the filters will be included in the CSV files.
+Also note that records files will be split into multiple files if they exceed 10,000 records. For example, if you have 20,000 users, you will get 2 files: `users.0.csv` and `users.1.csv`.
 
 ### Encrypting data using GPG