comma after "results"
"We" to "you" per the style guide
Assorted changes

Rewrite of the first paragraph. Deletion of last sentence in
"Understanding Context," and relocation of  "Features and Restrictions
by context" link to first mention of contexts.
Removing "Keeping the whole issue..."
Removing early reference to API changes

These are discussed a bit later on, so it's not necessary to mention
them here.