Update config option documentation

Author: orhantoy

README.md

@@ -65,10 +65,10 @@ The following is a complete list of options available for configuration in [engi
 
 | option | value type | required/optional | source |
 | -------------------- | ------------- | ----------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `engineName` | String | required | Found in your [App Search Dashboard](http://app.swiftype.com/as). |
-| `endpointBase` | String | optional  | Use this instead of "hostIdentifier" if you are using self managed. ex: "http://127.0.0.1:3002"  |
-| `hostIdentifier` | String | required  | Found in your [App Search Dashboard](http://app.swiftype.com/as). |
-| `searchKey` | String | required | Found in your [App Search Dashboard](http://app.swiftype.com/as). |
+| `engineName` | String | required | Found in your App Search Dashboard.  |
+| `endpointBase` | String | required* | (*) Elastic Enterprise Search deployment URL, example: "http://127.0.0.1:3002". Not required if using App Search on swiftype.com. |
+| `hostIdentifier` | String | required* | (*) Only required if using App Search on swiftype.com.  |
+| `searchKey` | String | required | Found in your App Search Dashboard.  |
 | `searchFields` | Array[String] | required | A list of fields that will be searched with your search term. |
 | `resultFields` | Array[String] | required | A list of fields that will be displayed within your results. |
 | `querySuggestFields` | Array[String] | optional | A list of fields that will be searched and displayed as query suggestions. |