better phraseology.

README.md

@@ -57,6 +57,6 @@ $ yo reveal:slide --markdown --attributes --notes "Slide Title"
 grunt dist
 ```
 
-Copy the `dist` file into the `gh-pages` branch of `https://github.com/uni-lu/slides`
+Copy the content of the `dist` folder into the `gh-pages` branch of `https://github.com/uni-lu/slides`
 
 Some hyperlinks need to be fixed. To do so edit the `index.html` file and remove all `../` before images location.