update issue templates

Author: kristoff-it

.github/ISSUE_TEMPLATE/crash.yml

@@ -23,6 +23,7 @@ body:
     attributes:
       label: Steps to Reproduce and Observed Behavior
       description: What exactly can someone else do, in order to observe the problem that you observed? Include error messages, if any.
+      value: ""
     validations:
       required: true
 

.github/ISSUE_TEMPLATE/error_message.yml

@@ -15,12 +15,14 @@ body:
     attributes:
       label: Steps to Reproduce and Observed Behavior
       description: What exactly can someone else do, in order to observe the problem that you observed? Include error messages, if any.
+      value: ""
     validations:
       required: true
   - type: markdown
     id: expected
     attributes:
       label: Expected Output according to the HTML spec
       description: "NOTE: failing to provide a quote from the WHATWG HTML living specification that shows the discrepancy might cause your issue to be closed without any explanation."
+      value: ""
     validations:
       required: true