Correct tracking issue link for skip_children

Update the issue link to point to issue 3389

Author: ytmimi

Configurations.md

@@ -2206,7 +2206,7 @@ Don't reformat out of line modules
 
 - **Default value**: `false`
 - **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: [#3389](https://github.com/rust-lang/rustfmt/issues/3386))
+- **Stable**: No (tracking issue: [#3389](https://github.com/rust-lang/rustfmt/issues/3389))
 
 ## `single_line_if_else_max_width`