Fixed import order in a couple of files

[freemanjp]

For consistency.

[codecov]

Codecov Report

Merging #170 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #170   +/-   ##
=========================================
  Coverage     72.66%   72.66%           
  Complexity      136      136           
=========================================
  Files            70       70           
  Lines           589      589           
  Branches        166      166           
=========================================
  Hits            428      428           
  Partials        161      161

Impacted Files	Coverage Δ	Complexity Δ
...n/maven/doxia/sink/kotlin/content/HeadContainer.kt	88.88% <ø> (ø)	2 <0> (ø)	⬇️

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