[docs] Fix model headings

docs/_static/checkpoints.csv

@@ -1,4 +1,4 @@
-Dataset,Metadata,BiLSTM,BERT,ST-GCN,SL-GCN
+Dataset,Metadata,BiLSTM,BERT,SL-GCN,ST-GCN
 :class:`~openhands.datasets.isolated.AUTSLDataset`,`autsl_metadata.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/autsl_metadata.zip>`_,`autsl_lstm.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/autsl_lstm.zip>`_,`autsl_bert.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/autsl_bert.zip>`_,`autsl_slgcn.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/autsl_slgcn.zip>`_,`autsl_stgcn.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/autsl_stgcn.zip>`_
 :class:`~openhands.datasets.isolated.CSLDataset`,`csl_metadata.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/csl_metadata.zip>`_,`csl_lstm.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/csl_lstm.zip>`_,`csl_bert.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/csl_bert.zip>`_,`csl_slgcn.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/csl_slgcn.zip>`_,`csl_stgcn.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/csl_stgcn.zip>`_
 :class:`~openhands.datasets.isolated.DeviSignDataset`,`devisign_metadata.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/devisign_metadata.zip>`_,`devisign_lstm.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/devisign_lstm.zip>`_,`devisign_bert.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/devisign_bert.zip>`_,`devisign_slgcn.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/devisign_slgcn.zip>`_,`devisign_stgcn.zip <https://github.com/AI4Bharat/OpenHands/releases/download/checkpoints_v1/devisign_stgcn.zip>`_