Generate docs (#8481)

* Generate docs

* Fix duplicated Optional and restore code block ticks

* Fix docbuild command errors, improve documentations

---------

Co-authored-by: Amedeo Lepore <amedeo.lepore85@gmail.com>
Co-authored-by: Amedeo Lepore <amedeo.lepore@hyland.com>

docs/core/services/notification.service.md

@@ -120,7 +120,7 @@ export class MyComponent implements OnInit {
 }
 ```
 
-By providing a `decorativeIcon` property in the `SnackBarData`, it is possible to render a decorative
+By providing a `decorativeIcon` property in the [`SnackBarData`](../../../lib/core/src/lib/snackbar-content/snack-bar-data.ts), it is possible to render a decorative
 [`MaterialIcon`](https://material.angular.io/components/icon/overview#interactive-icons) to the left of the message.
 
 ```ts

docs/core/services/people-process.service.md

@@ -32,7 +32,7 @@ Gets information about Process Services users.
     Gets information about users across all tasks.
     -   _taskId:_ `string`  - (Optional) ID of the task
     -   _searchWord:_ `string`  - (Optional) Filter text to search for
-    -   _groupId:_ `string`  - (Optional) 
+    -   _groupId:_ `string`  - (Optional)
     -   **Returns** [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`UserProcessModel`](../../core/models/user-process.model.md)`[]>` - Array of user information objects
 -   **involveUserWithTask**(taskId: `string`, idToInvolve: `string`): [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`UserProcessModel`](../../core/models/user-process.model.md)`[]>`<br/>
     Sets a user to be involved with a task.