Update index.md

Author: torum

docs/index.md

@@ -71,8 +71,8 @@ Image Viewer can be also launched via command-line, meaning other applications o
 `-t off`  or  `--effect=off`   
 
 - Picture stretch In (fit to window/screen when the size is bigger than window/screen. default on):  
-`-i on`  or  `--stretchIn=on`   
-`-i off`  or  `--stretchIn=off`   
+`-n on`  or  `--stretchIn=on`   
+`-n off`  or  `--stretchIn=off`   
 
 - Picture stretch Out (fit to window/screen when the size is smaller than window/screen. default off):  
 `-o on`  or  `--stretchOut=on`