doc/concepts.tex: Missing blank line before subsection.

[sod] / doc / concepts.tex

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@@ -273,6 +273,7 @@ to it in a slot.  (This will also help preserve binary compatibility, because
 the private structure can grow more members as needed.  See
 \xref{sec:fixme.compatibility} for more details.)
 
+
 \subsubsection{Vtables}