Added descriptive text to the particle effect example.

examples/particles/particlefx/particlefx.md

@@ -1,6 +1,6 @@
 ---
 title: Particle effect
-brief: This example shows a simple particle effect.
+brief: This example shows a simple particle effect. The particlefx component has all the values at default, except the image and animation used.
 scripts: particlefx.script
 ---