[ADF-4152] Updated folder structure of core docs (#4415)

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Manual fixes to core doc file links

* [ADF-4152] Further automatic + manual link tidying

docs/core/services/discovery-api.service.md

@@ -0,0 +1,33 @@
+---
+Title: Discovery Api service
+Added: v2.0.0
+Status: Active
+Last reviewed: 2018-11-19
+---
+
+# [Discovery Api service](../../../lib/core/services/discovery-api.service.ts "Defined in discovery-api.service.ts")
+
+Gets version and license information for Process Services and Content Services.
+
+## Class members
+
+### Methods
+
+-   **getBpmProductInfo**(): [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`BpmProductVersionModel`](../../../lib/core/models/product-version.model.ts)`>`<br/>
+    Gets product information for Process Services.
+    -   **Returns** [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`BpmProductVersionModel`](../../../lib/core/models/product-version.model.ts)`>` - ProductVersionModel containing product details
+-   **getEcmProductInfo**(): [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`EcmProductVersionModel`](../../../lib/core/models/product-version.model.ts)`>`<br/>
+    Gets product information for Content Services.
+    -   **Returns** [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`EcmProductVersionModel`](../../../lib/core/models/product-version.model.ts)`>` - ProductVersionModel containing product details
+
+## Details
+
+The product license and version information is returned using the
+classes defined in the [Product Version model](../models/product-version.model.md).
+See the
+[Alfresco JS API docs](https://github.com/Alfresco/alfresco-js-api/tree/master/src/alfresco-discovery-rest-api)
+to learn more about the REST API used by this service.
+
+## See also
+
+-   [Product version model](../models/product-version.model.md)