fix(doc): correct broken image link (#6448)

Author: lbwa

docs_app/content/guide/operators.md

@@ -105,7 +105,7 @@ To explain how operators work, textual descriptions are often not enough. Many o
 
 Below you can see the anatomy of a marble diagram.
 
-<img src="../../src/assets/images/guide/marble-diagram-anatomy.svg">
+<img src="../../assets/images/guide/marble-diagram-anatomy.svg">
 
 Throughout this documentation site, we extensively use marble diagrams to explain how operators work. They may be really useful in other contexts too, like on a whiteboard or even in our unit tests (as ASCII diagrams).