Update Folderpicker documentation on how to use the control with siteAbsoluteUrl property

docs/documentation/docs/controls/FolderPicker.md

@@ -42,6 +42,19 @@ import { FolderPicker, IFolder } from "@pnp/spfx-controls-react/lib/FolderPicker
                 canCreateFolders={true} />
 ```
 
+- To use the `FolderExplorer` control to fetch folders from different sitecollection in your code as follows:
+
+```TypeScript
+<FolderExplorer context={this.props.context}
+                rootFolder={{
+                  Name: 'Documents',
+                  ServerRelativeUrl: `/sites/TestSite2/Shared Documents`
+                }}
+                onSelect={this._onFolderSelect}
+                canCreateFolders={true} 
+                siteAbsoluteUrl="https://xxxx.sharepoint.com/sites/TestSite2"/>
+```
+
 - The `onSelect` change event returns the selected folder and can be implemented as follows:
 
 ```TypeScript