Update doc to use "term" instead of "terminal"

Very small patch, but the example at the top still used the old
"terminal" package name, resulting in "golang.org/x/crypto/ssh/terminal"
being goimport'd instead of golang.org/x/term

Change-Id: If02a2d7ef6fe63fa86f98ca16b523d06ad897474
GitHub-Last-Rev: 594c1a04a1f006800243fd09588a5c9df36bac19
GitHub-Pull-Request: golang/term#2
Reviewed-on: https://go-review.googlesource.com/c/term/+/276912
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Daniel Martí <mvdan@mvdan.cc>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Go Bot <gobot@golang.org>

term.go

diff --git a/term.go b/term.go
index 69931cc..2a4ccf8 100644
--- a/term.go
+++ b/term.go
@@ -7,11 +7,11 @@
 //
 // Putting a terminal into raw mode is the most common requirement:
 //
-// 	oldState, err := terminal.MakeRaw(0)
+// 	oldState, err := term.MakeRaw(0)
 // 	if err != nil {
 // 	        panic(err)
 // 	}
-// 	defer terminal.Restore(0, oldState)
+// 	defer term.Restore(0, oldState)
 package term
 
 // State contains the state of a terminal.