MANIFEST.in: fix up to address warning
MANIFEST.in: fix up to address warning

> warning: manifest_maker: MANIFEST.in, line 4: 'recursive-include' expects <dir> <pattern1> <pattern2> ...
> warning: no previously-included files matching '*' found under directory 'doc/build/*/'

Signed-off-by: Isaku Yamahata <4b3abd66323411eeceff090ab3754dd766fc4b25@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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