Fix header sizes

UPGRADE_GUIDE.md

@@ -12,7 +12,7 @@ The order of programming should go as follows
 2. Flash the `Host` with [`RadioHost32bit`](https://github.com/OpenBCI/OpenBCI_Radios/blob/master/examples/RadioHost32bit/RadioHost32bit.ino)
 3. Flash the `Pic` with [`DefaultBoard`](https://github.com/OpenBCI/OpenBCI_32bit_Library/blob/master/examples/DefaultBoard/DefaultBoard.ino)
 
-### Awesome New Features
+## Awesome New Features
 
 * Examples folder contains a bunch of awesome code to get you started as fast as possible!
 * Time syncing
@@ -21,21 +21,21 @@ The order of programming should go as follows
 * Change baud rate on `Host` to `230400` or `921600`
 * Change radio channel number from the computer
 
-### What this update set out to solve
+## What this update set out to solve
 
 * Removed burger code. Now you can send strings of commands from a driver instead of one at a time.
 * Moved mission critical code into library. Play around in the `.ino` files without breaking the core features of the board.
 * Over the air (OTA) programming stabilization.
 * Always send `$$$` after any text send from the board. (i.e. `d` and `c` just sent text with not `$$$`)
 
-### Resources
-#### In depth tutorials
+## Resources
+### In depth tutorials
 * [How to get/install/upload code to Pic32 `Board`](http://docs.openbci.com/tutorials/02-Upload_Code_to_OpenBCI_Board#upload-code-to-openbci-board-32bit-upload-how-to-firmware-version-2xx-fall-2016)
 * [How to get/install/upload code to `Host` and `Device`](http://docs.openbci.com/tutorials/03-Upload_Code_to_OpenBCI_Dongle#upload-code-to-openbci-radios-setting-up-your-system-to-program-openbci-radios-getting-radio-firmware-version-2xx-fall-2016)
 * [Packet protocol, including the new stop byte](http://docs.openbci.com/software/02-OpenBCI_Streaming_Data_Format#openbci-v3-data-format-binary-format)
 * [Writing custom firmware in a version 2.0.0 world; a peaceful experience](http://docs.openbci.com/tutorials/04-Updating_Custom_Firmware_to_2.0)
 
-#### New commands
+### New commands
 * [Time stamping/syncing commands](http://docs.openbci.com/software/01-OpenBCI_SDK#firmware-v200-new-commands-time-stamping)
 * [Radio channel commands](http://docs.openbci.com/software/01-OpenBCI_SDK#firmware-v200-new-commands-radio-configuration-commands)