doc: Fleshed out Number#ceil slightly.
doc: Fleshed out Number#ceil slightly.

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