Remove trailing whitespace

Author: fhennig

modules/contributor/pages/docs/style-guide.adoc

@@ -116,7 +116,7 @@ The alt text should describe what can be seen on the picture, to make the docume
 In general, follow the other guidelines. In particular, use PascalCase for API objects and `code style` for object properties.
 Start doc strings with an uppercase letter and finish with a period.
 
-If you want to link to a page like this one: 
+If you want to link to a page like this one:
 
     https://docs.stackable.tech/home/stable/concepts/authentication