doc: fix documentation of Event and Event#element.
doc: fix documentation of Event and Event#element.

baiyanghese/prototype,baiyanghese/prototype,Gargaj/prototype,ridixcr/prototype,erpframework/prototype,ldf7801528/prototype,loduis/prototype,ldf7801528/prototype,Jiasm/prototype,Jiasm/prototype,sdumitriu/prototype,loduis/prototype,erpframework/prototype,292388900/prototype,sstephenson/prototype,ldf7801528/prototype,loduis/prototype,fashionsun/prototype,lamsieuquay/prototype,fashionsun/prototype,lamsieuquay/prototype,ridixcr/prototype,ShefronYudy/prototype,lamsieuquay/prototype,ShefronYudy/prototype,fashionsun/prototype,leafo/prototype,ShefronYudy/prototype,ridixcr/prototype,Gargaj/prototype,sstephenson/prototype,292388900/prototype,leafo/prototype,erpframework/prototype,Jiasm/prototype,sdumitriu/prototype,292388900/prototype,sstephenson/prototype,sdumitriu/prototype,Gargaj/prototype