Update tutorial.md

tiny typo

osxphotos/tutorial.md

@@ -214,9 +214,9 @@ Another way to export metadata about your photos is through the use of sidecar f
 
 Unlike `--exiftool`, you do not need to install exiftool to use the `--sidecar` feature.  Many of the same configuration options that apply to `--exiftool` to modify metadata, for example, `--keyword-template` can also be used with `--sidecar`.  
 
-Sidecar files are named "photoname.ext.sidecar_ext".  For example, if the photo is named `IMG_1234.JPG` and the sidecar format is XMP, the sidecar would be named `IMG_1234.JPG.XMP`.  Some applications expect the sidecar in this case to be named `IMG_1234.XMP`.  You can use the `-sidecar-drop-ext` option to force osxphotos to name the sidecar files in this manner:
+Sidecar files are named "photoname.ext.sidecar_ext".  For example, if the photo is named `IMG_1234.JPG` and the sidecar format is XMP, the sidecar would be named `IMG_1234.JPG.XMP`.  Some applications expect the sidecar in this case to be named `IMG_1234.XMP`.  You can use the `--sidecar-drop-ext` option to force osxphotos to name the sidecar files in this manner:
 
-`osxphotos export /path/to/export --sidecar XMP -sidecar-drop-ext`
+`osxphotos export /path/to/export --sidecar XMP --sidecar-drop-ext`
 
 ## Updating a previous export