sensors-and-actuators: Fix link

Fix a link by no longer escaping special character since Hugo is smart
enough to not need that.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

content/designs/sensors-and-actuators.md

@@ -116,7 +116,7 @@ which could, for example, suggest routine maintenance tasks which need
 to be performed on the vehicle.
 
 (Taken from
-*http://www.w3.org/2014/automotive/vehicle\_spec.html\#h2\_abstract*.)
+*http://www.w3.org/2014/automotive/vehicle_spec.html#h2_abstract*.)
 
 #### Trailer