[ADF-2201] Tidied Start Process docs (#2864)

* [ADF-2201] Tidied Start Process docs

* [ADF-2201] Removed file with probably incorrect name

docs/select-apps-dialog.component.md

@@ -0,0 +1,29 @@
+# Select app Component
+
+Show all available apps and return the selected app.
+
+![select-apps-dialog](docassets/images/select-apps-dialog.png)
+
+## Basic Usage
+
+```ts
+import { SelectAppsDialogComponent } from '@alfresco/adf-process-services';
+
+constructor(private dialog: MatDialog) {
+}
+   
+startSelectDialog(){
+   const dialogRef = this.dialog.open(SelectAppsDialogComponent, {
+       width: '630px',
+       panelClass: 'adf-version-manager-dialog'
+   });
+   
+   dialogRef.afterClosed().subscribe(selectedProcess => {
+       this.processId = selectedProcess.id;
+   });
+}
+```
+
+## See Also
+
+-   [Start process component](start-process.component.md)