Fixed Particle2D docs - radians to degrees for some params
Fixed Particle2D docs - radians to degrees for some params

(cherry picked from commit 5687fa470962fc3f6528e6886284e3e965e7e35c)

pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1