DOC-3275: Update Angular guide for self hosting, failing on licenseKey prop.

Author: kemister85

modules/ROOT/partials/integrations/angular-quick-start.adoc

@@ -61,10 +61,11 @@ import { EditorComponent } from '@tinymce/tinymce-angular';
   <h1>{productname} {productmajorversion} Angular Demo</h1>
   <editor
     [init]="init"
+    licenseKey="gpl"
   />
   `
 })
-export class AppComponent {
+export class App {
   init: EditorComponent['init'] = {
     plugins: 'lists link image table code help wordcount'
   };

modules/ROOT/partials/integrations/angular-tech-ref.adoc

@@ -97,6 +97,7 @@ The editor accepts the following properties:
 <editor
   apiKey="no-api-key"
   cloudChannel="{productmajorversion}"
+  licenseKey="gpl"
   [disabled]="false"
   [readonly]="false"
   id=""
@@ -146,6 +147,9 @@ include::partial$integrations/common/license-key-property.adoc[]
 <editor licenseKey="gpl" />
 ----
 
+[TIP]
+The `+licenseKey="gpl"+` property must be set on the `<editor>` component.
+
 [[cloudchannel]]
 === `+cloudChannel+`