doc/go1.1.html: fix typo in URL

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7423050

doc/go1.1.html

@@ -193,7 +193,7 @@ for example, run
 </p>
 
 <pre>
-$ go get code.google.com/go.exp/ssa
+$ go get code.google.com/p/go.exp/ssa
 </pre>
 
 <p>
@@ -201,7 +201,7 @@ and then in Go source,
 </p>
 
 <pre>
-import "code.google.com/go.exp/ssa"
+import "code.google.com/p/go.exp/ssa"
 </pre>
 
 <h3 id="TODO">TODO</h3>