update issue template to remove poor advice about labels

.github/ISSUE_TEMPLATE.md

@@ -1,18 +1,23 @@
 ## Pre-issue checklist
+
 _Please check that you have taken the steps below:_
 
 - [ ] Search the Issues pages for related discussions and suggestions
 
 ## Summary:
+
 _Please provide a short summary of your suggestion or issue (just a couple of sentences)._
 
 ## Description:
+
 _Describe the issue in detail, as clearly as possible. Please be specific wherever you can._
 
 ## Contributions:
+
 _Would you be interested in implementing your suggested improvement or other change? If you are, do you want or need assistance in making any changes in this repository?_
 
 ## Post-issue checklist
+
 _Please check that you have taken the steps below_
 
-- [ ] Added a suitable label or labels for this issue from the `Labels` button in the sidebar
+- [ ] Suggest a suitable label or labels for this issue (the `Labels` button in the sidebar has the current list, but please feel free to suggest useful additions)