Fix weird formatting in missing guide warnings

We don't want this:

> Guide Guide{url=https://cn.quarkus.io/guides/extension-faq} is ignored since we were not able to find an HTML content file for it.

"Guide" is repeated, that's weird.

We want this:

> Guide{url=https://cn.quarkus.io/guides/extension-faq} is ignored since we were not able to find an HTML content file for it.

src/main/java/io/quarkus/search/app/quarkusio/QuarkusIO.java

@@ -565,7 +565,7 @@ private Guide createCoreGuide(GitCloneDirectory cloneDirectory, String quarkusVe
             // So if it's missing, that's important context when investigating other errors.
             failureCollector.info(
                     FailureCollector.Stage.TRANSLATION,
-                    "Guide " + guide + " is ignored since we were not able to find an HTML content file for it.");
+                    guide + " is ignored since we were not able to find an HTML content file for it.");
             return null;
         }