Ahodges/doc/relnotes20141021

@mhoeber , @catong , @srpearce please take a look -- anything else to add? 
@explorerleslie , @shnayder ?
@catong: from a search of the PDF, it looks like we pretty much say "the Advanced Settings page". 2-3 times, we use a phrase like "change the advanced settings in your course". In a procedural step, we just say "click Advanced Settings".