Coding Style Cleanup

In adding HTMLBox to the comparison of WYSIWYG editor comparison in the handbook it doesn't pass because of a missing space in string concatenation on line 105 as follows:

Line 105: string concatenation should be formatted with a space separating the operators (dot .) and non-quote terms
'#description' => t('Coma separated items from the options below. Use the words right next to the icons.'). theme('htmlbox_settings_item', $buttons),