doc: fix magick example

Author: Matt-Deacalion

man/patch.diff

@@ -338,7 +338,7 @@ Taking a screenshot and annotating it with \fBImageMagick\fP(1):
 .PP
 .nf
 .fam C
-  $ scrot - | convert -pointsize 64 -gravity North -annotate '+16+16' 'hello, world!' - out.png
+  $ scrot - | magick - -pointsize 64 -gravity North -annotate +16+16 'hello, world' out.png
 
 .fam T
 .fi

man/scrot.1

@@ -206,7 +206,7 @@ Selecting a window by PID with xdo(1):
 
 Taking a screenshot and annotating it with ImageMagick(1):
 
-  $ scrot - | convert -pointsize 64 -gravity North -annotate '+16+16' 'hello, world!' - out.png
+  $ scrot - | magick - -pointsize 64 -gravity North -annotate +16+16 'hello, world' out.png
 
 AUTHOR
   scrot was originally developed by Tom Gilbert.