docs/blueprints: Fix list formating

List didn't display fine, if not prefixed by empty line.

Relate-to: https://allscenarios.readthedocs.io/en/latest/meta-ohos/blueprints/touchpanel.html
Forwarded: https://git.ostc-eu.org/OSTC/OHOS/meta-ohos/-/merge_requests/226


Signed-off-by: Philippe Coval <rzr@users.sf.net>

docs/blueprints/touchpanel.rst

@@ -12,6 +12,7 @@ Overview
 ********
 
 The TouchPanel Blueprint provides support for building a PoC smart touch panel that can be used in other smart devices to accept input and display status. Some features to demonstrate include:
+
 #. Accepting input from a keypad
 #. Accepting input from UI icons on a touch panel
 #. Ability to send input data securely over the network