Document update: Adding note about triggering update after modifying attributes 

I spent awhile trying to figure out how to enable/disable an initialised chosen field. Eventually, I found this issue with comments that explains how to do it: https://github.com/harvesthq/chosen/pull/651. IMO it's not that clear from the docs so I've added a note w/ example to the options page.

Added new style definition for paragraphs after a table (table+p), removed inline margin & fixed example alignment issue.