ms4: README typo

ms4/README.md

@@ -193,7 +193,7 @@ Here is one suggested way to go about tackling all of this.
 
 1. During initializaiton, the driver will need to allocate **physically
   contiguous** memory for the request and response queue, and pass these
-  addresses to the driver. You can allocate with additional calls to
+  addresses to the device. You can allocate with additional calls to
   `dma_alloc_alloc()`. Also implement corresponding MMIO registers in the
   simulator.