Update BatchNormalization.lua
Update BatchNormalization.lua

Fix typo
xianjiec/nn,kmul00/nn,joeyhng/nn,elbamos/nn,caldweln/nn,nicholas-leonard/nn,sagarwaghmare69/nn,apaszke/nn,colesbury/nn,jhjin/nn,jonathantompson/nn,andreaskoepf/nn,diz-vara/nn,eriche2016/nn,PraveerSINGH/nn