Update markdown-guidelines.md

src/pages/markdown-guidelines.md

@@ -170,7 +170,7 @@ In this sentence _this_ _part_ is italic.
    1) sub item
 ```
 
-### Images/Figures
+### Images/Figures/Files
 
 In addition to the image itself we also provide a alternatives text "alt" in the square brackets. In markdown captions are not supported. We will use the same text as the "alt" in italic writing directly under the image. All kind of files must be named in kebab-case.