fixed typo for javadoc
fixed typo for javadoc

marianvandzura/jmagick,Marfeel/jmagick,marianvandzura/jmagick,marianvandzura/jmagick,Marfeel/jmagick,azureplus/jmagick,ferbar/jmagick,techblue/jmagick,azureplus/jmagick,techblue/jmagick,azureplus/jmagick,ferbar/jmagick,Marfeel/jmagick,techblue/jmagick,ferbar/jmagick