Documentation: Add HOWTO Korean translation into rst based build system

This commit adds Korean translation of HOWTO document into rst based
documentation build system.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/index.rst

@@ -59,6 +59,14 @@ needed).
    80211/index
    security/index
 
+Korean translations
+-------------------
+
+.. toctree::
+   :maxdepth: 1
+
+   translations/ko_KR/index
+
 Indices and tables
 ==================