Update episodes/editing.md

Co-authored-by: Toby Hodges <[email protected]>

episodes/editing.md

@@ -148,7 +148,7 @@ carpentry
 
 The "carpentry" variable works with the {varnish} package to control the logo displayed on your lesson. You can display your own logo by
 
-1. Adding your organisation's logo file (e.g. 'ice-cream-logo.svg') to your fork of `varnish` in the `inst/pkgdown/assets/assets/images` folder. 
+1. Adding the logo file as SVG (e.g. 'ice-cream-logo.svg') to your fork of {varnish} in the `inst/pkgdown/assets/assets/images` folder. 
 1. Setting `carpentry` to match the name of your logo file. (e.g. 'ice-cream')
 1. Adding 'varnish: [YOUR-GITHUB-USERNAME]/varnish' to the Customization section of your lessons `config.yaml` file.