Fix grammatical error

Signed-off-by: Lohit Agarwalla/Application S/W Group /SRI-Delhi/Engineer/Samsung Electronics <[email protected]>

Author: alohit

docs/platform/developing/flashing-rpi.md

@@ -24,7 +24,7 @@ IoT Setup Manager supports the following operating systems:
 
 ## SD card set up
 
-The SD card must be formatted before flashing image into it.
+The SD card must be formatted before flashing the image into it.
 
 ### Ubuntu tools