Fix typos in doc/design-storagetypes.rst
Fix typos in doc/design-storagetypes.rst

Signed-off-by: Gangbiao Liu <9a4db330741fc51aa2f9bd2adf797e098cd069c7@gmail.com>
Signed-off-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

ganeti/ganeti,ganeti/ganeti,bitemyapp/ganeti,mbakke/ganeti,andir/ganeti,yiannist/ganeti,leshchevds/ganeti,mbakke/ganeti,grnet/snf-ganeti,onponomarev/ganeti,leshchevds/ganeti,andir/ganeti,leshchevds/ganeti,ganeti/ganeti,grnet/snf-ganeti,andir/ganeti,mbakke/ganeti,yiannist/ganeti,yiannist/ganeti,onponomarev/ganeti,bitemyapp/ganeti