Fix vale linting: active voice and sentence length

Author: alicenstar

docs/vendor/event-notifications-create.mdx

@@ -74,11 +74,11 @@ To create an event notification subscription:
 
          The test result displays the HTTP status code and response time, or an error message with troubleshooting guidance. If you configured a signing secret, the test request is signed with HMAC-SHA256 so you can also verify your signature validation logic.
 
-      1. (Optional) In the **Failure alert contact** field, enter the email address that should receive notifications when webhook delivery permanently fails after all retries are exhausted.
+      1. (Optional) In the **Failure alert contact** field, enter the email address to notify when webhook delivery permanently fails.
 
-         You can type a team member's name or email address to search for suggestions, or enter any external email address (such as an on-call routing address for PagerDuty or OpsGenie).
+         Type a team member's name or email to search for suggestions. You can also enter any external email address, such as an on-call routing address for PagerDuty or OpsGenie.
 
-         If no failure alert contact is configured, Replicated notifies the subscription creator and all team admins by default.
+         Without a failure alert contact, Replicated notifies the subscription creator and all team admins by default.
 
    <!-- TODO: Add screenshot of delivery method selection -->