doc: Fixed consistency of bootloader term

Fixed the consistency of the term bootloader.

Signed-off-by: Francesco Servidio <francesco.servidio@nordicsemi.no>
diff --git a/boot/mynewt/README.md b/boot/mynewt/README.md
index d8e44b7..e482d6d 100644
--- a/boot/mynewt/README.md
+++ b/boot/mynewt/README.md
@@ -1,6 +1,6 @@
 # MCUboot - apps/boot
 
-This sample app implements a boot loader for the Mynewt OS (apache.mynewt.org).
+This sample app implements a bootloader for the Mynewt OS (apache.mynewt.org).
 This app requires the following Mynewt repositories:
     * @mcuboot (this one)
     * @apache-mynewt-core