Fixed typo `twinning' in comment of `twin'.


git-svn-id: https://freeelks.svn.sourceforge.net/svnroot/freeelks/trunk@712 6d4a7a74-6026-0410-acef-abb7cea3cd6d
Fixed typo for `necessary'.


git-svn-id: https://freeelks.svn.sourceforge.net/svnroot/freeelks/trunk@713 6d4a7a74-6026-0410-acef-abb7cea3cd6d