[spp] [PATCH] docs: fix typos of command example

[Ferruh Yigit]

On 6/12/2018 12:16 PM, ogawa.yasufumi at lab.ntt.co.jp wrote:
> From: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>
> 
> Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>

Applied, thanks.