warnings with east and rotate parameter in sphere example

[maghraba]

OpenScad2021.1
[WARNING: variable east not specified as parameter in file text_on_sphere.scad, line 15](#15, C:/.../text_on_OpenSCAD-master/examples/text_on_sphere.scad)

[WARNING: variable rotate not specified as parameter in file text_on.scad, line 445](https://github.com/brodykenrick/text_on_OpenSCAD/issues/445 C:/.../text_on_OpenSCAD-master/text_on.scad)
[WARNING: variable halign not specified as parameter in file text_on.scad, line 445](https://github.com/brodykenrick/text_on_OpenSCAD/issues/445, C:/.../text_on_OpenSCAD-master/text_on.scad)
[WARNING: variable valign not specified as parameter in file text_on.scad, line 445](https://github.com/brodykenrick/text_on_OpenSCAD/issues/445, C:/.../text_on_OpenSCAD-master/text_on.scad)
[WARNING: Ignoring unknown variable 'east' in file C:/.../text_on_OpenSCAD-master/examples/text_on_sphere.scad, line 25](https://github.com/brodykenrick/text_on_OpenSCAD/issues/25, C:/.../text_on_OpenSCAD-master/examples/text_on_sphere.scad)
ECHO: undef

...
translate([10,100,-20]){
color("blue")
sphere(25);
color("lightblue")
text_on_sphere("Rounded"
,r=25
,extrusion_height=4
,spin=45
,northsouth=30
,east=20
,size=20
,rounded=false
,center=true);
}
echo(east);
...