Use correct number in comment

Co-authored-by: Piotr Delawski <[email protected]>

classes/class-admin.php

@@ -851,7 +851,7 @@ public function erase_large_records( int $total, int $done, int $last_entry, int
 			return;
 		}
 
-		// We will do at most 500000 at a time.
+		// We will do at most 250000 at a time.
 		$batch_size = apply_filters( 'wp_stream_batch_size', 250000 );
 
 		// This will tend to erase them in reverse chronological order,