Added missing javadoc to fix for #795.
Added missing javadoc to fix for #795.

tgvaughan/beast2,Anaphory/beast2,Anaphory/beast2,Anaphory/beast2,tgvaughan/beast2,tgvaughan/beast2,tgvaughan/beast2,CompEvol/beast2,CompEvol/beast2,CompEvol/beast2,Anaphory/beast2,CompEvol/beast2