Retain issue body to allow file attachments

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -58,5 +58,6 @@ body:
       required: true
   - type: markdown
     attributes:
-      value: "### Additional information
-      You can use the space below to provide any additional information or to attach files."
+      value: |
+        ### Additional information
+        You can use the space below to provide any additional information or to attach files.

.github/ISSUE_TEMPLATE/documentation_change.yaml

@@ -33,5 +33,6 @@ body:
       required: true
   - type: markdown
     attributes:
-      value: "### Additional information
-      You can use the space below to provide any additional information or to attach files."
+      value: |
+        ### Additional information
+        You can use the space below to provide any additional information or to attach files.

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -53,5 +53,6 @@ body:
         of a new Python package? (Not all new features introduce new dependencies.)"
   - type: markdown
     attributes:
-      value: "### Additional information
-      You can use the space below to provide any additional information or to attach files."
+      value: |
+        ### Additional information
+        You can use the space below to provide any additional information or to attach files.

.github/ISSUE_TEMPLATE/housekeeping.yaml

@@ -22,5 +22,6 @@ body:
       required: true
   - type: markdown
     attributes:
-      value: "### Additional information
-      You can use the space below to provide any additional information or to attach files."
+      value: |
+        ### Additional information
+        You can use the space below to provide any additional information or to attach files.