Need a comma here
Merge pull request #221 from up_the_irons/typo-fixes

Need a comma here
Add Spanning Tree section
Rewrite, reformat, clarify STP section
Merge pull request #222 from tomc603/master

Add Spanning Tree section
Improve bootloader usage mention

Clarify where in the bootloader info block execution begins.
Merge pull request #223 from robbat2/patch-2

Improve bootloader usage mention
Add Cron Output Section

Many of us have been bit by cron's silent failures, only to find out that our jobs haven't
been running for hours, or worse, days. Cron's output, though great in theory, isn't as
reliable or as helpful as it could be. Our team has made sure to include this common
"pitfall" in our teaching sessions and thought it would serve nicely here as well. Feedback
appreciated!