Added blank line after summary tag to fix markdown handling

.gitlab/issue_templates/Bug.md

@@ -45,6 +45,7 @@ logs, and code as it's tough to read otherwise.)
 
 <details>
 <summary>Expand for output related to GitLab environment info</summary>
+
 <pre>
 
 (For installations with omnibus-gitlab package run and paste the output of:

changelogs/unreleased/fix_bug_issue_template_markdown_handling.yml

+---
+title: Fix bug issue template handling of markdown
+merge_request: 27808
+author: Lee Tickett
+type: fixed