Remove eol whitespace from doc file

Remove these extraneous end of line spaces.

Signed-off-by: David Brown <david.brown@linaro.org>

docs/index.md

@@ -2,12 +2,12 @@
 
 ## Overview
 
-MCUBoot is a secure bootloader for 32-bit MCUs.   The goal of MCUBoot is to 
-define a common infrastructure for the bootloader, system flash layout on 
-microcontroller systems, and to provide a secure bootloader that enables 
+MCUBoot is a secure bootloader for 32-bit MCUs.   The goal of MCUBoot is to
+define a common infrastructure for the bootloader, system flash layout on
+microcontroller systems, and to provide a secure bootloader that enables
 easy software upgrade.
 
-MCUboot is operating system and hardware independent, and relies on 
+MCUboot is operating system and hardware independent, and relies on
 hardware porting layers from the operating system it works with.  Currently
 MCUboot works with both the Apache Mynewt, and Zephyr operating systems, but
 more ports are planned in the future. RIOT is currently supported as a boot
@@ -16,17 +16,17 @@ target with a complete port planned.
 ## Roadmap
 
 The issues being planned and worked on are tracked on Jira. To participate
-please visit: 
+please visit:
 
 [MCUboot JIRA](https://runtimeco.atlassian.net/projects/MCUB/summary)
 
-## Browsing 
+## Browsing
 
 Information and documentation on the bootloader is stored within the source, and on confluence:
 
 [Confluence page](https://runtimeco.atlassian.net/wiki/discover/all-updates)
 
-For more information in the source, here are some pointers: 
+For more information in the source, here are some pointers:
 
 - [boot/bootutil](https://github.com/runtimeco/mcuboot/tree/master/boot/bootutil): The core of the bootloader itself.
 - [boot/boot\_serial](https://github.com/runtimeco/mcuboot/tree/master/boot/boot_serial): Support for serial upgrade within the bootloader itself.