Update example in documentation of Text.Blaze
Update example in documentation of Text.Blaze

 * Use toHtml instead of string
 * Add missing import for forM_

iblech/blaze-html,Soostone/blaze-html-haste,mikehat/blaze-all,dylex/blaze-markup,mikehat/blaze-all,dylex/blaze-markup,Soostone/blaze-markup-haste,iblech/blaze-html,Soostone/blaze-markup-haste,FranklinChen/blaze-markup,jgm/blaze-html,jgm/blaze-html,FranklinChen/blaze-markup,jgm/blaze-html,mikehat/blaze-all