[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/models/user-process.model.md

@@ -0,0 +1,24 @@
+---
+Title: User Process model
+Added: v2.0.0
+Status: Active
+---
+
+# [User Process model](../../../lib/core/models/user-process.model.ts "Defined in user-process.model.ts")
+
+Represents a Process Services user.
+
+## Details
+
+This class contains basic information about a Process Services user and
+is used throughout ADF to identify and list users (eg, to assign them to
+a task or to list them in search results).
+
+Note that the Typescript class for this model is in active development;
+it is likely to change and so its properties are not listed here. For the
+latest version of the class, see the
+[source file](https://github.com/Alfresco/alfresco-ng2-components/blob/development/lib/core/models/user-process.model.ts).
+
+## See also
+
+-   [People process service](../services/people-process.service.md)