billing: small change for feedback survey in cancellation flow (#22380)

## Description
- subscription downgrade in Admin Console/Billing Console now requires a
feedback survey, it is no longer optional

## Related issues or tickets
-
[ENGDOCS-2540](https://docker.atlassian.net/browse/ENGDOCS-2540?atlOrigin=eyJpIjoiNjhkNGM0YjQ0MjUzNGRlODhiYTllNDJkNDYwYTJlNDIiLCJwIjoiaiJ9)

## Reviews
- [ ] Editorial review

[ENGDOCS-2540]:
https://docker.atlassian.net/browse/ENGDOCS-2540?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: sarahsanders-docker

content/manuals/subscription/change.md

@@ -80,8 +80,7 @@ To downgrade your Docker subscription:
 2. Under Settings and administration, select **Billing**.
 3. Select the account you want to downgrade in the drop-down at the top-left of the page.
 4. Select the action icon and then **Cancel subscription**.
-5. Review the cancellation warnings, then select **Confirm cancellation**.
-6. Optional. Fill out the feedback survey, or select **Skip**.
+5. Fill out the feedback survey to continue with cancellation.
 
 {{< /tab >}}
 {{< tab name="Legacy Docker plan" >}}