remove migration info

Author: mdbirnstiehl

solutions/observability/incident-management/create-custom-threshold-rule.md

@@ -244,12 +244,4 @@ The following variables are specific to this rule type. You can also specify [va
 `context.viewInAppUrl`
 :   Link to the alert source.
 
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-% What needs to be done: Align serverless/stateful
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-% Use migrated content from existing pages that map to this page:
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-% - [ ] ./raw-migrated-files/observability-docs/observability/custom-threshold-alert.md
-% - [ ] ./raw-migrated-files/docs-content/serverless/observability-create-custom-threshold-alert-rule.md
+:::::