update docs

Author: DanielLiu1123

website/docs/20-extensions/80-customization.mdx

@@ -31,7 +31,7 @@ If any method in the interface returns a reactive type (Mono/Flux), then `WebCli
 **In most cases, you don't need to explicitly specify the client type.**
 
 :::warning
-The `connectTimeout` settings are not supported by `WEB_CLIENT`.
+The `connectTimeout` settings are not supported by `WEB_CLIENT` when using version < `3.5.0`.
 :::
 
 ## HttpClientCustomizer