Update git submodules
* Update mistral-extra from branch 'master'
to 31816e64f10c11ab9edf2a301f408eab68e6b010
- Merge "Remove unused sphinx extensions"
- Remove unused sphinx extensions
Change-Id: I83ee4016b4d0b7bfa12291a4610b34c9c8a3d476
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
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