Add distinction between DNS Aliases for Direct Mode vs NAT Mode to
describe the feature in ar71xx PR#573.
Include small format changes for firmware install steps.
Include note for tunneling using nodes with built-in switches.
Minor formatting tweaks.
Minor formatting changes on Installing Firmware.
Minor formatting changes to four sections, making formats consistent
across sections.
Format Install Firmware section consistently.
More formatting consistency checks in additional doc sections.
* Update release to 3.20.3.0
Update release number in screenshots to 3.20.3.0. Include new comment
field for tunnels.
* Update wording for firmware targets
Update wording for firmware targets.
* Add steps to Firmware Upgrade Tips
Add steps to the Firmware Upgrade Tips section, and include more info in
the OLSR Restart section.
Steve Lewis AB7PA