Fix typos (#1143)

Found via `codespell -S .mypy_cache,yarn.lock,*.json,*.ipynb -L
rouge,nam,vie`

model/supervised_finetuning/custom_datasets/README.md

@@ -23,5 +23,5 @@ Issues and TODO:
 - ideally we can update the config yaml and new dataset will be download from
   hub
 
-  - one possible idea is we upload the trasform format of these dataset to the
+  - one possible idea is we upload the transform format of these dataset to the
     OA hub

model/supervised_finetuning/custom_datasets/qa_datasets.py

@@ -314,7 +314,7 @@ class JokeExplaination(Dataset):
             for line in f:
                 data = json.loads(line)
                 joke = data["joke"]
-                explanation = data["explaination"]
+                explanation = data["explanation"]
                 self.pairs.append((joke, explanation))
 
         if len(question) > 0 and len(answer) > 0: