Add a missing comment opening in the helper templates

What does this MR do?

This adds a missing comment opening in the helper templates. This missing open comment does not break the chart it simply forces the comment into the template output. Since the actual templated output of _helper.tpl files is discarded by Helm it has no impact on the chart.

But the comment open should be there for the sake of editors and humans reading and parsing the text.

Related issues

• #5330 (closed)

Author checklist

See Definition of done.

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Required

• Merge Request Title and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
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Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added/updated
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened
• Equivalent MR/issue for Gitlab Operator project opened (see Operator documentation on impact of Charts changes)
• Validate potential values for new configuration settings. Formats such as integer 10, duration 10s, URI scheme://user:passwd@host:port may require quotation or other special handling when rendered in a template and written to a configuration file.