ssh/terminal: fix a typo
ssh/terminal: fix a typo

Change-Id: Iafe2ebb6d37afd2a64aa72750a722d4860bb735e
Reviewed-on: https://go-review.googlesource.com/34535
Run-TryBot: Mikio Hara <e2f4d2eec1d9a1f781345cdd7260d7d52e6468ae@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/term