The build error has been introduced by 56dcc319cf.
Using a <simplesect/> within a <para/> is not allowed and subsequently
fails to validate while building the manual.
So instead, I moved the <simplesect/> further down and outside of the
<para/> to fix this.
Signed-off-by: aszlig <aszlig@nix.build>
Cc: @aaronjanse, @Lassulus, @danbst