docs/zh_CN: add translation of dev-tools/kmsan.rst

Add translation of kmsan.rst and remove it from TODO list.
update to commit 3f53d1b ("docs/dev-tools: fix a typo")

Signed-off-by: Haoyang Liu <tttturtleruss@hust.edu.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241019142243.88712-1-tttturtleruss@hust.edu.cn

Author: tttturtle-russ

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

@@ -22,6 +22,7 @@ Documentation/translations/zh_CN/dev-tools/testing-overview.rst
    sparse
    kcov
    kcsan
+   kmsan
    gcov
    kasan
    ubsan
@@ -32,7 +33,6 @@ Todolist:
 
  - checkpatch
  - coccinelle
- - kmsan
  - kfence
  - kgdb
  - kselftest