docs: Update migration note for plugin registry (#6702)

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Signed-off-by: Ben Sherman <bentshermann@gmail.com>

Author: bentsherman

docs/migrations/25-10.md

@@ -201,7 +201,7 @@ export NXF_PLUGINS_REGISTRY_URL="https://raw.githubusercontent.com/nextflow-io/p
 ```
 
 :::{note}
-Plugin developers will not be able to submit PRs to the legacy plugin index once the plugin registry is generally available. Plugins should be updated to publish to the Nextflow plugin registry using the {ref}`Nextflow Gradle plugin <gradle-plugin-page>` instead. See {ref}`plugin-registry-page` for details.
+Plugins should be updated to publish to the Nextflow plugin registry using the {ref}`Nextflow Gradle plugin <gradle-plugin-page>` instead of the legacy plugin index. See {ref}`plugin-registry-page` for details.
 :::
 
 <h3>New syntax for workflow handlers</h3>