well im not really sure how to have multiple group ids under one condition but you can do this
in your postbit template search for this
PHP Code:
<if condition="$post['edit_reason']">$vbphrase[reason]: $post[edit_reason]</if>
replace with
PHP Code:
<if condition="$post[usergroupid]==7">$vbphrase[reason]: $post[edit_reason]</if>
<if condition="$post[usergroupid]==6">$vbphrase[reason]: $post[edit_reason]</if>
<if condition="$post[usergroupid]==5">$vbphrase[reason]: $post[edit_reason]</if>
i added 3conditionals for each group u have u can replase 7,6,5 with whatever group u have ur moderators in or whatever group u want the ability to see the edit reason.
6= administrators
7= moderators
5= super moderators
someone correct me if their is an alternative.