Fix header formatting in documentation

[schmidtsv]

Description

One of the headers lacked a space between # and the Text, leading it to be rendered as normal text, not ad header.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing performed?

• Unit tests
• Integration tests
• Acceptance tests

Checklist:

• This PR is being made against the main branch, or relevant version branch
• I have made corresponding changes to the documentation
• I have added testing for my changes

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[chombium]

LGTM! Thanks for the fix @schmidtsv

[ctlong]

Thanks for taking the time to fix this!