docs: Fix markdown in total-solutions.md

Fix the issues that
* the `Blinky Example` link is broken
* the bullet point is not rendered properly, because the "strict" syntax
of markdown used by MkDocs requires an empty line before the bullet
point item.

Signed-off-by: Lingkai Dong <lingkai.dong@arm.com>

docs/total-solutions.md

@@ -43,7 +43,8 @@ The following Total Solutions applications demonstrate the latest Arm technlogie
 All of the applications above have TrustedFirmware-M enabled in their systems. They come with support for building them with [`Arm Compiler for Embedded`][arm-compiler-for-embedded] using [`CMake`][cmake]. Though TS-PixelGraphics also comes with [`GNU Arm Embedded Toolchain`][gnu-arm-embedded-toolchain] support.
 
 The following Total Solutions application demonstrates the basic use of the Open IoT SDK *without* the latest technologies (such as `TrustedFirmware-M`) enabled:
-* [`Blinky Example`] - periodically blinks an LED
+
+* [`Blinky Example`][blinky-example] - periodically blinks an LED
 
 Building `Blinky Example` is only supported with [`GNU Arm Embedded Toolchain`][gnu-arm-embedded-toolchain].