Takashi NATSUME e75598be31 api-ref: Fix a broken link ...

The link to the API extension document has been broken.
The API extension document does not exist currently,
so just remove the link.

Change-Id: I8920a00004528f5fa30d1b5a2f53ffa5f65f2ea8

2019-07-05 13:24:18 +09:00

..

source

api-ref: Fix a broken link

2019-07-05 13:24:18 +09:00