chore: remove redundant space of yaml

Signed-off-by: chansuke <[email protected]>

docs/generated/notification-services/slack.md

@@ -34,56 +34,56 @@ The Slack notification service configuration includes following settings:
 1. Invite your slack bot to this channel **otherwise slack bot won't be able to deliver notifications to this channel**
 1. Store Oauth access token in `argo-rollouts-notification-secret` secret
 
-    ```yaml
-      apiVersion: v1
-      kind: Secret
-      metadata:
-          name: argo-rollouts-notification-secret
-      stringData:
-          slack-token: <Oauth-access-token>
-    ```
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+    name: argo-rollouts-notification-secret
+stringData:
+    slack-token: <Oauth-access-token>
+```
 
 1. Define service type slack in data section of `argo-rollouts-notification-configmap` configmap:
 
-    ```yaml
-      apiVersion: v1
-      kind: ConfigMap
-      metadata:
-        name: argo-rollouts-notification-configmap
-      data:
-        service.slack: |
-          token: $slack-token
-    ```
+```yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: argo-rollouts-notification-configmap
+data:
+  service.slack: |
+    token: $slack-token
+```
 
 1. Add annotation in application yaml file to enable notifications for specific argocd app.  The following example uses the [on-sync-succeeded trigger](../catalog.md#triggers):
 
-    ```yaml
-      apiVersion: argoproj.io/v1alpha1
-      kind: Application
-      metadata:
-        annotations:
-          notifications.argoproj.io/subscribe.on-sync-succeeded.slack: my_channel
-    ```
+```yaml
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  annotations:
+    notifications.argoproj.io/subscribe.on-sync-succeeded.slack: my_channel
+```
 
 1. Annotation with more than one [trigger](../catalog.md#triggers), with multiple destinations and recipients
 
-    ```yaml
-      apiVersion: argoproj.io/v1alpha1
-      kind: Application
-      metadata:
-        annotations:
-          notifications.argoproj.io/subscriptions: |
-            - trigger: [on-scaling-replica-set, on-rollout-updated, on-rollout-step-completed]
-              destinations:
-                - service: slack
-                  recipients: [my-channel-1, my-channel-2]
-                - service: email
-                  recipients: [recipient-1, recipient-2, recipient-3 ]
-            - trigger: [on-rollout-aborted, on-analysis-run-failed, on-analysis-run-error]
-              destinations:
-                - service: slack
-                  recipients: [my-channel-21, my-channel-22]
-    ```
+```yaml
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  annotations:
+    notifications.argoproj.io/subscriptions: |
+      - trigger: [on-scaling-replica-set, on-rollout-updated, on-rollout-step-completed]
+        destinations:
+          - service: slack
+            recipients: [my-channel-1, my-channel-2]
+          - service: email
+            recipients: [recipient-1, recipient-2, recipient-3 ]
+      - trigger: [on-rollout-aborted, on-analysis-run-failed, on-analysis-run-error]
+        destinations:
+          - service: slack
+            recipients: [my-channel-21, my-channel-22]
+```
 
 ## Templates