docs: move checktransupdate.py to tools/docs

The checktranslate.py tool currently languishes in scripts/; move it to
tools/docs and update references accordingly.

Cc: Alex Shi <[e-mail]>
Cc: Yanteng Si <[e-mail]>
Cc: Dongliang Mu <[e-mail]>
Reviewed-by: Mauro Carvalho Chehab <[e-mail]>
Acked-by: Jani Nikula <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/doc-guide/checktransupdate.rst

···
 
 ::
 
-   ./scripts/checktransupdate.py --help
+   tools/docs/checktransupdate.py --help
 
 Please refer to the output of argument parser for usage details.
 
 Samples
 
--  ``./scripts/checktransupdate.py -l zh_CN``
+-  ``tools/docs/checktransupdate.py -l zh_CN``
    This will print all the files that need to be updated in the zh_CN locale.
--  ``./scripts/checktransupdate.py Documentation/translations/zh_CN/dev-tools/testing-overview.rst``
+-  ``tools/docs/checktransupdate.py Documentation/translations/zh_CN/dev-tools/testing-overview.rst``
    This will only print the status of the specified file.
 
 Then the output is something like:

Documentation/translations/zh_CN/doc-guide/checktransupdate.rst

···
 
 ::
 
-    ./scripts/checktransupdate.py --help
+    tools/docs/checktransupdate.py --help
 
 具体用法请参考参数解析器的输出
 
 示例
 
--  ``./scripts/checktransupdate.py -l zh_CN``
+-  ``tools/docs/checktransupdate.py -l zh_CN``
    这将打印 zh_CN 语言中需要更新的所有文件。
--  ``./scripts/checktransupdate.py Documentation/translations/zh_CN/dev-tools/testing-overview.rst``
+-  ``tools/docs/checktransupdate.py Documentation/translations/zh_CN/dev-tools/testing-overview.rst``
    这将只打印指定文件的状态。
 
 然后输出类似如下的内容：

Documentation/translations/zh_CN/how-to.rst

···
 对于首次参与 Linux 内核中文文档翻译的新手，建议您在 linux 目录中运行以下命令：
 ::
 
-	./script/checktransupdate.py -l zh_CN``
+	tools/docs/checktransupdate.py -l zh_CN``
 
 该命令会列出需要翻译或更新的英文文档，结果同时保存在 checktransupdate.log 中。
 

MAINTAINERS

···
 P:	Documentation/doc-guide/maintainer-profile.rst
 T:	git git://git.lwn.net/linux.git docs-next
 F:	Documentation/
-F:	scripts/checktransupdate.py
 F:	scripts/documentation-file-ref-check
 F:	scripts/get_abi.py
 F:	scripts/kernel-doc*

scripts/checktransupdate.py tools/docs/checktransupdate.py

···
 differences occur, report the file and commits that need to be updated.
 
 The usage is as follows:
-- ./scripts/checktransupdate.py -l zh_CN
+- tools/docs/checktransupdate.py -l zh_CN
 This will print all the files that need to be updated or translated in the zh_CN locale.
-- ./scripts/checktransupdate.py Documentation/translations/zh_CN/dev-tools/testing-overview.rst
+- tools/docs/checktransupdate.py Documentation/translations/zh_CN/dev-tools/testing-overview.rst
 This will only print the status of the specified file.
 
 The output is something like:
···
 def valid_locales(locale):
     """Check if the locale is valid or not"""
     script_path = os.path.dirname(os.path.abspath(__file__))
-    linux_path = os.path.join(script_path, "..")
+    linux_path = os.path.join(script_path, "../..")
     if not os.path.isdir(f"{linux_path}/Documentation/translations/{locale}"):
         raise ArgumentTypeError("Invalid locale: {locale}")
     return locale
···
 def main():
     """Main function of the script"""
     script_path = os.path.dirname(os.path.abspath(__file__))
-    linux_path = os.path.join(script_path, "..")
+    linux_path = os.path.join(script_path, "../..")
 
     parser = ArgumentParser(description="Check the translation update")
     parser.add_argument(