CI: more qa template changes (#16533)

More qa template changes

.github/DISCUSSION_TEMPLATE/q-a.yml

@@ -39,8 +39,6 @@ body:
           required: true
         - label: I used the GitHub search to find a similar question and didn't find it.
           required: true
-        - label: I am sure that this is a bug in LangChain rather than my code.
-          required: true
   - type: checkboxes
     id: help
     attributes:
@@ -50,6 +48,7 @@ body:
 
           * Read open questions until I find 2 where I can help someone and add a comment to help there.
           * I already hit the "watch" button in this repository to receive notifications and I commit to help at least 2 people that ask questions in the future.
+          * Once my question is answered, I will mark the answer as "accepted".
       options:
         - label: I commit to help with one of those options 👆
           required: true