docs: pdfdocs: Enable language-specific font choice of zh_TW translations

The "TC" variants are supposed to be the choice for traditional
Chinese documents.

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Reviewed-by: Hu Haowen <src.res@email.cn>
Tested-by: Hu Haowen <src.res@email.cn>
Link: https://lore.kernel.org/r/9d8e8fa2-3e7a-3a0a-1a0d-7d797a605ff8@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/translations/zh_TW/index.rst

@@ -5,6 +5,7 @@
 	\renewcommand\thesection*
 	\renewcommand\thesubsection*
 	\kerneldocCJKon
+	\kerneldocBeginTC
 
 .. _linux_doc_zh_tw:
 
@@ -162,3 +163,6 @@ TODOList:
 
 * :ref:`genindex`
 
+.. raw:: latex
+
+	\kerneldocEndTC