Fix YAML syntax error in failure comment - use single quotes instead of heredoc

Author: spbolton

.github/workflows/issue_comp_link-issue-to-pr.yml

@@ -265,8 +265,7 @@ jobs:
           pr_url="${{ inputs.pr_url }}"
           pr_number=$(echo "$pr_url" | grep -o '[0-9]*$')
           
-          comment_body=$(cat <<'EOF'
-## ❌ Issue Linking Required
+          comment_body='## ❌ Issue Linking Required
 
 This PR could not be linked to an issue. **All PRs must be linked to an issue** for tracking purposes.
 
@@ -277,7 +276,7 @@ This PR could not be linked to an issue. **All PRs must be linked to an issue**
 2. Click "Link issue" and select an existing issue
 
 **Option 2: Add keyword to PR body**
-Edit this PR's description and add one of these lines:
+Edit this PR description and add one of these lines:
 - `This PR fixes: #123`
 - `This PR closes: #123` 
 - `This PR resolves: #123`
@@ -292,9 +291,7 @@ Create a new branch with one of these patterns:
 Issue linking ensures proper tracking, documentation, and helps maintain project history. It connects your code changes to the problem they solve.
 
 ---
-*This comment was automatically generated by the issue linking workflow*
-EOF
-)
+*This comment was automatically generated by the issue linking workflow*'
 
           curl -X POST \
             -H "Accept: application/vnd.github+json" \