docs: Move ja_JP/howto.rst to ja_JP/process/howto.rst

Let Japanese translation of howto.rst in the language drop-down list
by moving it to the expected place.

Signed-off-by: Akira Yokosawa <[email protected]>
Cc: Tsugikazu Shibata <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Message-ID: <[email protected]>

Author: akiyks

Documentation/translations/ja_JP/index.rst

@@ -11,7 +11,7 @@
 .. toctree::
    :maxdepth: 1
 
-   howto
+   process/howto
 
 .. raw:: latex