remove description duplication in DatasetInfo

`self.config.description` and `_DESCRIPTION` are actually the same (see line 74)

minds14.py

@@ -114,7 +114,7 @@ class Minds14(datasets.GeneratorBasedBuilder):
         )
 
         return datasets.DatasetInfo(
-            description=self.config.description + "\n" + _DESCRIPTION,
+            description=_DESCRIPTION,
             features=features,
             supervised_keys=("audio", "transcription"),
             homepage=self.config.homepage,