calls: Add docs and minor corrections

Author: negative0

package.json

@@ -3,7 +3,7 @@
   "version": "1.0.6-0",
   "description": "Java Script bindings for rclone rc api",
   "main": "src/index.js",
-  "module": "ex/index.js",
+  "module": "es/index.js",
   "type": "module",
   "scripts": {
     "test": "echo \"Skipping tests for now TODO\"",