Remove some hints in help-threads

[Zabuzard]

When creating a new help-thread, we post several hints. Two of them are obsolete for now and should be deleted entirely to reduce noise:

• How to post code (we have automatic code detection and code-actions as alternative)
• How to close (we auto-close anyways)

[AdityaM2205]

Hey,would love to help on the issue,could you please assign it to me