Update docs/src/main/asciidoc/extension-writing-dev-service.adoc

Co-authored-by: Guillaume Smet <[email protected]>

docs/src/main/asciidoc/extension-writing-dev-service.adoc

@@ -23,7 +23,7 @@ include::_attributes.adoc[]
 If your extension provides APIs for connecting to an external service, it's a good idea to provide a xref:dev-services.adoc[Dev Service] implementation.
 
 To create a Dev Service, add a new build step into the extension processor class that returns a `DevServicesResultBuildItem`.
-Here, the https://hub.docker.com/_/hello-world[`hello world`] image is used, but you should set up the right image for your service.
+Here, the https://hub.docker.com/_/hello-world[`hello-world`] image is used, but you should set up the right image for your service.
 
 [source%nowrap,java]
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