devguide - intro - Removed addressed comments.
devguide ch02, 03 - move section "Creating Plugins to extend Plugins" to ch03
devguide - 03-portlet... - Update localization section
devguide - 03-portlet... - Update summary, headings, and topic list.
devguide - 03-portlet... - tabs-to-spaces
devguide - 03-portlet... - Localization - Use the My Greeting Portlet to demonstrate.
devguide - 03-portlet... - correct examples.