Bug template: Improve description of confirmation

Improvement requests are allowed in addition to actual bugs.

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -58,7 +58,7 @@ body:
       description: |
         Please select if the following are applicable
       options:
-        - label: I am sure this is a bug
+        - label: I am sure this is a bug, or improvement that is well enough described that it can be implemented
           required: true
         - label: |
             If this is for a specific device, the device config is mentioned above, or diagnostics are included.