Docs: fix typo (#1350)

docs/components/data-sources/qna.mdx

@@ -1,5 +1,5 @@
 ---
-title: '❓💬 Queston and answer pair'
+title: '❓💬 Question and answer pair'
 ---
 
 QnA pair is a local data type. To supply your own QnA pair, use the data_type as `qna_pair` and enter a tuple. Eg:
@@ -10,4 +10,4 @@ from embedchain import App
 app = App()
 
 app.add(("Question", "Answer"), data_type="qna_pair")
-```
+```