fix: comments and logic tidy up

src/file/generateFileUploadForm.ts

@@ -1,6 +1,15 @@
 import * as NodeFormData from 'form-data'
 import { convertToCSV } from '../utils/convertToCsv'
 
+/**
+ * One of the approaches SASjs takes to send tables-formatted JSON (see README)
+ * to SAS is as multipart form data, where each table is provided as a specially
+ * formatted CSV file.
+ * @param formData Different objects are used depending on whether the adapter is
+ *  running in the browser, or in the CLI
+ * @param data Special, tables-formatted JSON (see README)
+ * @returns Populated formData
+ */
 export const generateFileUploadForm = (
   formData: FormData | NodeFormData,
   data: any