Fixed some comments

Author: AGlass0fMilk

usb/device/targets/TARGET_NORDIC/TARGET_MCU_NRF52840/USBPhyHw.h

@@ -94,7 +94,7 @@ class USBPhyHw : public USBPhy {
     // Nordic transfer structures for each in/out endpoint
     nrf_drv_usbd_transfer_t transfer_buf[18];
 
-    // Returns the appropraite transfer structure buffer for the given endpoint
+    // Returns the appropriate transfer structure buffer for the given endpoint
     nrf_drv_usbd_transfer_t* get_transfer_buffer(usb_ep_t endpoint);
 
     // Returns the corresponding enumeration given an mbed endpoint number

usb/device/targets/TARGET_NORDIC/TARGET_MCU_NRF52840/USBPhy_Nordic.cpp

@@ -357,6 +357,13 @@ void USBPhyHw::endpoint_stall(usb_ep_t endpoint) {
 void USBPhyHw::endpoint_unstall(usb_ep_t endpoint) {
 	nrf_drv_usbd_ep_t ep = get_nordic_endpoint(endpoint);
 	nrf_drv_usbd_ep_stall_clear(ep);
+
+	/*
+	 * This is a somewhat hacky fix to fully "unload"
+	 * an IN endpoint after a buffer has been
+	 * transferred via EasyDMA...
+	 */
+
 	nrf_drv_usbd_ep_disable(ep);
 	nrf_drv_usbd_ep_enable(ep);
 }