Corrected formatting of definition terms

The output was appending the bolded terms to the preceding definition.
I indented each definition so that the terms appear on their own lines,
making this more readable.
Added an image showing endorsement button
Fixes and completions

Mark's edit on what to do about the honor code, change forum to
discussion, complete sentences
changed image per Gre's comment

Greg indicated that a single long thread can actually be a negative
experience, so changed the example so that it isn't of an [INTRO] thread
Edits from Greg, Mary, Jane, Mark