I'm trying to customize the OOTB Markup Styles in the Ribbon in SP2010 for the Rich Text Editor. I've found some documentation about the process, and one of the first steps is to add a PrefixStyleSheet attribute to the PublishingWebControls:RichHtmlField element in the page layout for layouts that use the Rich HTML Editor.
Making that change to the page layout in SP Designer does remove the OOTB Markup Styles, but I'm wondering how to apply the change across site collections? We have a number of site collections that use the same page layout, but I noticed that when I added the attribute to the page layout in one site collection, that change doesn't carry over to other site collections. Do I need to deploy a feature to make this change? Or is there an easy way to globally change a page layout in all site collections that have that layout?