Wordsmith dev guide introduction chapter
General editing for clarity and conciseness.  Removed the note that we already introduced the presence of a portlets folder since I did not see it.  Perhaps it was referring to the last chapter which is the Plugins SDK chapter, but I think the chapter should be a self-contained unit.
Merge branch 'DEVGUIDEwordsmith' of https://github.com/jhinkey/liferay-docs into DEVGUIDEwordsmith to see changes made and continue working on dev guide wordsmithing task
Primarily editing for conciseness and clarity, general wordsmithing. Changed 3 instances of ... etc., simply to etc. (removed ...).