Fix dockerd reference heading levels #598
Merged
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Commit ddadd3d (moby/moby#32569) changed the heading levels of various sections, but as a result, the "daemon configuration file" section (and other sections) changed from a H2 to a H4, therefore no longer showing up in the page's TOC / navigation bar.
This patch changes the heading level to a H3 for sections that should show up in the page navigation.
ping @mstanleyjones PTAL