docs/zh_CN: Add dev-tools/kmemleak Chinese translation

Translate dev-tools/kmemleak.rst into Chinese and add it into
zh_CN/dev-tools/index.rst.
Signed-off-by: Haoyang Liu <tttturtleruss@hust.edu.cn>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240406083643.5056-1-tttturtleruss@hust.edu.cn

Documentation/translations/zh_CN/dev-tools/index.rst

@@ -23,13 +23,13 @@ Documentation/translations/zh_CN/dev-tools/testing-overview.rst
    gcov
    kasan
    ubsan
+   kmemleak
    gdb-kernel-debugging
 
 Todolist:
 
  - coccinelle
  - kcov
- - kmemleak
  - kcsan
  - kfence
  - kgdb