finally explained how to lower the curve order

components/sections/drawing/content.en-GB.md

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+# Drawing Bezier paths
+
+- draw with a mouse, stylus, or finger
+- RDP to reduce the number of points along the path
+- abstract curve through points:
+  - high order bezier, split and reduced
+  - fit compound bezier
+  - catmull-rom
+
+<div className="figure">
+  <Graphic title="Fitting a Bézier curve" setup={this.setup} draw={this.draw} onClick={this.onClick}>
+    <button onClick={this.toggle}>toggle</button>
+    <button onClick={this.reset}>reset</button>
+    <SliderSet ref={ set => (this.sliders=set) } onChange={this.processTimeUpdate} />
+  </Graphic>
+</div>
+