README: clarify arm images slightly

Author: classabbyamp

README.md

@@ -44,9 +44,9 @@ First create a ROOTFS for the desired architecture, then use
 #### Generating ARM images
 
 Platform-specific filesystem images contain a basic filesystem layout (`/` and
-`/boot` partitions), ready to be copied to the target drive with `dd`. despite
-the naming, they are not traditional "live" images like those available on x86
-platforms, and do not need installation like live ISOs.
+`/boot` partitions), ready to be copied to the target drive with `dd`. These are
+not "live" images like those available on x86 platforms, and do not need
+installation like live ISOs.
 
 To generate these images, first create a PLATFORMFS for the desired platform,
 then use [*mkimage.sh*](#mkimagesh) to generate the image.