Fix rpicam demo

Author: zhu-hongwei

documentation/asciidoc/computers/camera/rpicam_still.adoc

@@ -118,7 +118,7 @@ First, create a directory where you can store your time lapse photos:
 $ mkdir timelapse
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-Run the following command to create a time lapse over 30 seconds, recording a photo every two seconds, saving output into `image0001.jpg` through `image0014.jpg`:
+Run the following command to create a time lapse over 30 seconds, recording a photo every two seconds, saving output into `image0000.jpg` through `image0013.jpg`:
 
 [source,console]
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