Abn content fixes (#6957)

* Remove double backslashes from markdown files.

Neither github nor the ABN understands them.

* Make a <br /> tag self-closing, for the purposes of the ABN

docs/content-services/components/document-list.component.md

@@ -473,7 +473,7 @@ Now you can access Document List properties or call methods directly:
 console.log(documentList.currentFolderId);
 ```
 
-**Important note**:\\
+**Important note**:
 You must not access child components any earlier in the component lifecycle than
 the `AfterViewInit` state. Any UI click (buttons, links, etc.) event handlers are fine but
 an earlier event like `ngOnInit` is not.

docs/core/services/auth-guard-sso-role.service.md

@@ -31,7 +31,7 @@ const appRoutes: Routes = [
 ```
 
 If the user now clicks on a link or button that follows this route, they will be not able to access this content if they do not have the Realms roles.
-<br>**Note**: An additional role ALFRESCO_ADMINISTRATORS can be used in the roles array, which will result in checking whether the logged in user has Content Admin capabilities or not, as this role is not part of the JWT token it will call a Content API to determine it.
+<br />**Note**: An additional role ALFRESCO_ADMINISTRATORS can be used in the roles array, which will result in checking whether the logged in user has Content Admin capabilities or not, as this role is not part of the JWT token it will call a Content API to determine it.
 
 
 Client role Example

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

@@ -120,7 +120,7 @@ export class SomePageComponent implements OnInit {
 ```
 
 In the above sample code the `file` is uploaded via an HTML input element.
-The `processInstanceId` refers to a process instance ID for a running process in APS.\\
+The `processInstanceId` refers to a process instance ID for a running process in APS.
 The returned `relContent` object looks like in this sample:
 
     Related content: