fix(docs): change example to not use LaTeX

Author: jeertmans

docs/source/reference/examples.md

@@ -100,19 +100,23 @@ And later use this class anywhere in your code:
 :linenos:
 
 class SubclassExample(MovingCameraSlide):
-    def construct(self):
-        eq1 = Text("x", "=", "1")
-        eq2 = Text("x", "=", "2")
+    """Example taken from ManimCE's docs."""
 
-        self.play(Write(eq1))
+    def construct(self):
+        self.camera.frame.save_state()
 
-        self.next_slide()
+        ax = Axes(x_range=[-1, 10], y_range=[-1, 10])
+        graph = ax.plot(lambda x: np.sin(x), color=WHITE, x_range=[0, 3 * PI])
 
-        self.play(
-            TransformMatchingTex(eq1, eq2),
-            self.camera.frame.animate.scale(0.5)
-        )
+        dot_1 = Dot(ax.i2gp(graph.t_min, graph))
+        dot_2 = Dot(ax.i2gp(graph.t_max, graph))
+        self.add(ax, graph, dot_1, dot_2)
 
+        self.play(self.camera.frame.animate.scale(0.5).move_to(dot_1))
+        self.next_slide()
+        self.play(self.camera.frame.animate.move_to(dot_2))
+        self.next_slide()
+        self.play(Restore(self.camera.frame))
         self.wait()
 ```
 
@@ -135,18 +139,20 @@ directly write the `construct` method in the body of `MovingCameraSlide`.
     
     class SubclassExample(MovingCameraSlide):
         def construct(self):
-            eq1 = Text("x", "=", "1")
-            eq2 = Text("x", "=", "2")
+            self.camera.frame.save_state()
     
-            self.play(Write(eq1))
+            ax = Axes(x_range=[-1, 10], y_range=[-1, 10])
+            graph = ax.plot(lambda x: np.sin(x), color=WHITE, x_range=[0, 3 * PI])
     
-            self.next_slide()
-    
-            self.play(
-                TransformMatchingTex(eq1, eq2),
-                self.camera.frame.animate.scale(0.5)
-            )
+            dot_1 = Dot(ax.i2gp(graph.t_min, graph))
+            dot_2 = Dot(ax.i2gp(graph.t_max, graph))
+            self.add(ax, graph, dot_1, dot_2)
     
+            self.play(self.camera.frame.animate.scale(0.5).move_to(dot_1))
+            self.next_slide()
+            self.play(self.camera.frame.animate.move_to(dot_2))
+            self.next_slide()
+            self.play(Restore(self.camera.frame))
             self.wait()
 ```