Changed note-link to https in signals.rst (#3446)

getting_started/step_by_step/signals.rst

@@ -14,7 +14,7 @@ send out a message that other nodes can listen for and respond to. For example,
 rather than continuously checking a button to see if it's being pressed, the
 button can emit a signal when it's pressed.
 
-.. note:: You can read more about the observer pattern here: http://gameprogrammingpatterns.com/observer.html
+.. note:: You can read more about the observer pattern here: https://gameprogrammingpatterns.com/observer.html
 
 Signals are a way to *decouple* your game objects, which leads to better organized
 and more manageable code. Instead of forcing game objects to expect other objects

getting_started/step_by_step/ui_code_a_life_bar.rst

@@ -213,8 +213,8 @@ of information. And you will update the state of your connected node
 .. note::
 
     The Observer pattern, that signals derive from, still adds a bit of coupling between node branches. But it's generally lighter and more secure than accessing nodes directly to communicate between two separate classes. It can be okay for a parent node to get values from its children. But you'll want to favor signals if you're working with two separate branches.
-    Read Game Programming Patterns for more information on the `Observer pattern <http://gameprogrammingpatterns.com/observer.html>`_.
-    The `full book <http://gameprogrammingpatterns.com/contents.html>`_ is available online for free.
+    Read Game Programming Patterns for more information on the `Observer pattern <https://gameprogrammingpatterns.com/observer.html>`_.
+    The `full book <https://gameprogrammingpatterns.com/contents.html>`_ is available online for free.
 
 With this in mind, let's connect the ``GUI`` to the ``Player``. Click on
 the ``Player`` node in the scene dock to select it. Head down to the