Tweak wording in README

Author: lurch

README.md

@@ -12,7 +12,7 @@ For information on previous releases and version changelists, visit https://gith
 <sup>*NOTE: The list of OSes in this image is indicative only. It will vary according to your Raspberry Pi model and the availability of OSes on our remote download repository.</sup>
 
 ### About
-On first boot NOOBS will format your SD card and allow you to select which OSes you want to install from a list. This OS list is automatically generated from both locally available OSes (i.e. those contained in the `/os` directory on disk) or those available from our remote repository (network connection required).
+On first boot NOOBS will repartition your SD card and allow you to select which OSes you want to install from a list. This OS list is automatically generated from both locally available OSes (i.e. those contained in the `/os` directory on disk) or those available from our remote repository (network connection required).
 
 Only the latest version of each OS will ever be displayed meaning that you can be sure that you have installed the most up-to-date release of your selected OS.