docs: sparse: convert sparse.txt to RST

docs: sparse: convert sparse.txt to RST

Follow Randy's advice [1] to move
Documentation/translations/zh_TW/dev-tools/sparse.txt
to
Documentation/translations/zh_TW/dev-tools/sparse.rst

[1] https://lore.kernel.org/lkml/bfab7c5b-e4d3-d8d9-afab-f43c0cdf26cf@infradead.org/

Suggested-by: Jonathan Corbet <corbet@lwn.net>
Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Min-Hua Chen <minhuadotchen@gmail.com>
[jc: fixed htmldocs warning]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20230902052512.12184-3-minhuadotchen@gmail.com