[new uImage] Fix *.its files location in documentation

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt
index 3f7104f..1d75458 100644
--- a/doc/uImage.FIT/source_file_format.txt
+++ b/doc/uImage.FIT/source_file_format.txt
@@ -259,4 +259,4 @@
 8) Examples
 -----------
 
-Please see examples/*.its for actual image source files.
+Please see doc/uImage.FIT/*.its for actual image source files.