Update 621-graphics-pset.markdown

Author: Joe7M

_build/reference/621-graphics-pset.markdown

@@ -3,16 +3,16 @@
 > PSET [STEP] x,y [, color| COLOR color]
 
 Draws a pixel at coordinate `x`,`y` with color `color`. If `color` is not defined, the current foreground color will be used.
-If STEP is used, the graphics cursor will be moved by `x` pixels in x-direction and `y` pixel in y-direction and then the pixel
+If `STEP` is used, the graphics cursor will be moved by `x` pixels in x-direction and `y` pixel in y-direction and then the pixel
 will be drawn.
 
 ### Example:
 
 ```
 color 10                    ' Set foreground color 10
 PSET 50,50                  ' Point at 50,50 with foreground color 
-PSET 60,60, 11              ' Point at 60,60 with color 5
-PSET 70,70 COLOR 12         ' Point at 70,70 with color 6
+PSET 60,60, 11              ' Point at 60,60 with color 11
+PSET 70,70 COLOR 12         ' Point at 70,70 with color 12
 PSET 80,80, rgb(255,255,0)  ' Point at 80,80 with color yellow
-PSET STEP 10,10 COLOR 13    ' Point at 90,90 with color 7
+PSET STEP 10,10 COLOR 13    ' Point at 90,90 with color 13
 ```