fix: dag.import description in core docs (#4013)

Co-authored-by: achingbrain <[email protected]>

Author: Alan Shaw

docs/core-api/DAG.md

@@ -203,7 +203,7 @@ within the CARs.
 
 | Name | Type | Description |
 | ---- | ---- | ----------- |
-| sources | `AsyncIterable<Uint8Array>` | `AsyncIterable<AsyncIterable<Uint8Array>>` | One or more [CAR file][] streams |
+| sources | `AsyncIterable<Uint8Array>` | One or more [CAR file][] streams |
 
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