docs: Add extra warnings as 25.10 is added to platform (#6655)

Co-authored-by: Ben Sherman <[email protected]>

Author: christopher-hakkaart

docs/migrations/25-10.md

@@ -41,7 +41,9 @@ See {ref}`workflow-params-def` for details.
 
 <h3>Workflow outputs (out of preview)</h3>
 
-{ref}`Workflow outputs <workflow-output-def>`, introduced in Nextflow 24.04 as a preview feature, have been brought out of preview and can now be used without the `nextflow.preview.output` feature flag.
+{ref}`Workflow outputs <workflow-output-def>`, introduced in Nextflow 24.04 as a preview feature, have been brought out of preview.
+
+If you were using a preview version of workflow outputs, you must remove the `nextflow.preview.output` feature flag when upgrading to Nextflow 25.10. Setting this feature flag in 25.10 will cause your pipeline to fail.
 
 The final version adds the ability to specify a type annotation for each output declaration:
 

docs/tutorials/workflow-outputs.md

@@ -30,9 +30,11 @@ Workflow outputs were introduced to address these problems by providing a unifie
 
 ## Timeline
 
-Nextflow {ref}`24.04 <workflow-outputs-first-preview>` introduced the workflow output definition as a preview feature. It has since undergone multiple revisions, with the third preview currently available in Nextflow {ref}`25.04 <workflow-outputs-third-preview>`.
+Workflow outputs are stable in Nextflow {ref}`25.10 <workflow-outputs-final>`.
 
-Nextflow 25.10 will finalize workflow outputs and bring them out of preview. The `publishDir` directive will continue to be supported, but will be deprecated. It may be removed in a future release.
+This feature is also available as a preview in Nextflow {ref}`24.04 <workflow-outputs-first-preview>`, {ref}`24.10 <workflow-outputs-second-preview>`, and {ref}`25.04 <workflow-outputs-third-preview>`. If you are upgrading from a preview version of workflow outputs, you must remove the `nextflow.preview.output` feature flag, as it is not supported in Nextflow 25.10.
+
+The `publishDir` directive will continue to be supported, but will be deprecated. It may be removed in a future release.
 
 ## Example: rnaseq-nf