Add USB interface

Author: santaimpersonator

docs/hardware_overview.md

@@ -117,7 +117,7 @@ The GNSS Flex pHAT also comes populated with two sets of 2x10 pin, 2mm pitch mal
 
 
 ## Board Layout
-The GNSS Flex system is designed around two 2x10-pin, 2mm pitch headers used mate the two types of boards. A standardized pin layout, keeps the ecosystem pin-compatible for upgrades and allows board to be easily swapped for repairs. Depending on the capabilities of the GNSS receiver, these pins will breakout the UART (x4), I<sup>2</sup>C, and SD card interfaces along with any PPS or event signals of the GNSS receiver.
+The GNSS Flex system is designed around two 2x10-pin, 2mm pitch headers used mate the two types of boards. A standardized pin layout, keeps the ecosystem pin-compatible for upgrades and allows board to be easily swapped for repairs. Depending on the capabilities of the GNSS receiver, these pins will breakout the USB, UART (x4), I<sup>2</sup>C, and SD card interfaces along with any PPS or event signals of the GNSS receiver.
 
 
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