Merge branch '30933-docs-aqualls-quickstart' into 'master'

Docs: review and update AutoDevops quickstart

See merge request gitlab-org/gitlab!29374

doc/.vale/gitlab/spelling-exceptions.txt

@@ -2,6 +2,7 @@ Akismet
 Alertmanager
 Algolia
 Ansible
+Anthos
 API
 approvers
 Artifactory
@@ -135,6 +136,7 @@ initializers
 interdependencies
 interdependency
 Irker
+Istio
 jasmine-jquery
 JavaScript
 Jaeger

doc/topics/web_application_firewall/quick_start_guide.md

@@ -58,7 +58,7 @@ under which this application will be deployed.
 1. On the project's landing page, click **Add Kubernetes cluster**
    (note that this option is also available when you navigate to **Operations > Kubernetes**).
 
-   ![Project landing page](../autodevops/img/guide_project_landing_page_v12_3.png)
+   ![Project landing page](../autodevops/img/guide_project_landing_page_v12_10.png)
 
 1. On the **Create new cluster on GKE** tab, click **Sign in with Google**.