Update docs for SDK 2.8.
Update docs for SDK 2.8.

pebble/cloudpebble,thunsaker/cloudpebble,math-foo/cloudpebble,thunsaker/cloudpebble,thunsaker/cloudpebble,pebble/cloudpebble,pebble/cloudpebble,pebble/cloudpebble,math-foo/cloudpebble,math-foo/cloudpebble,math-foo/cloudpebble,thunsaker/cloudpebble,pebble/cloudpebble