.github: Improve issue template description

We received several times issues that the repro steps are human readable
text with ambiguous instructions. That usually ends up in maintainers
asking questions so people provide clear steps.

Let's just make the issue template more clear in that regard.

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -25,6 +25,8 @@ body:
   - type: textarea
     attributes:
       label: Steps to reproduce the issue
+      description: |
+        As much as possible, try to make steps that would work in a script. This makes the repro unambiguous and easy to follow.
       value: |
         1.
         2.