Updated STM32F405 Timer Triggering (markdown)

STM32F405-Timer-Triggering.md

@@ -26,7 +26,7 @@ The update_event is also generated by:
 
 refer to Timer app note: DM00042534.pdf
 
-##Timer synchronisation
+## Timer synchronisation
 
 A Master can control a slave Timer using a Trigger TRGO.
 A Timer is slaved if its ITRx is connected to a Slave and the Master is set to use TRGO