- Subdivides prev Example 3 into two:
- Create an update for the mix
- Build an image
- Adds subsection Format Bump to explain its purpose and swupd protocols
- Adds Figure 1 and new _figures/mixer dir to illustrate Format Bump
- Modifies some commands to clarify intent, purpose
- Closes#507
Signed-off-by: Michael Vincerra <michael.vincerra@intel.com>