Minor: Improve documentation for catalog.has_header
config option
#10452
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Which issue does this PR close?
Part of #7013
Rationale for this change
While reviewing #10404 I found the documentation on this config option a little confusing and go read code to understand what it did.
I would like to document it better for my future self (and hopefully others)
What changes are included in this PR?
Update doc string for catalog.has_header config
Are these changes tested?
Are there any user-facing changes?