Update documentation/src/docs/asciidoc/user-guide/advanced-topics/launcher-api.adoc

Co-authored-by: Marc Philipp <[email protected]>

Author: mpkorstanje

documentation/src/docs/asciidoc/user-guide/advanced-topics/launcher-api.adoc

@@ -14,7 +14,7 @@ tests. Moreover, third party test libraries – like Spock or Cucumber – can p
 JUnit Platform's launching infrastructure by providing a custom
 <<test-engines,TestEngine>>.
 
-image::launcher-api-diagram.svg[]
+image::launcher-api-diagram.svg[role=text-center]
 
 The launcher API is in the `{junit-platform-launcher}` module.