s/rendering adjustments/rendering settings

since googling doesn't find this when searching for  'rendering settings' to which we always refer.

See https://www.openmicroscopy.org/community/viewtopic.php?f=5&t=7635&p=14732#p14732 for where this would have helped.
Merge pull request #10 from kennethgillen/patch-1

s/rendering adjustments/rendering settings