fix: polish book title

ronething · ronething · commit eea8b434d553 · 2025-09-26T01:09:30.000+08:00
Signed-off-by: Ashing Zheng &lt;axingfly@gmail.com&gt;
diff --git a/book/book.toml b/book/book.toml
@@ -2,7 +2,7 @@
 authors = ["The Kubebuilder Maintainers"]
 multilingual = false
 src = "src"
-title = "The Kubebuilder Book"
+title = "The Kubebuilder Book(简体中文)"
 
 [output.html]
 smart-punctuation = true
