fix some incorrect symbols before executing command

Signed-off-by: lixiaobing10051267 <li.xiaobing1@zte.com.cn>
Upstream-commit: 7b73b5fd6acf7a8fc3e9cee3437221794879b7c6
Component: engine

components/engine/docs/security/https/README.md

@@ -14,20 +14,20 @@ At this point, it has to be a manual thing, and I've been running it in boot2doc
 My process is as following:
 
     $ boot2docker ssh
-    $$ git clone https://github.com/docker/docker
-    $$ cd docker/docs/articles/https
-    $$ make cert
+    root@boot2docker:/# git clone https://github.com/docker/docker
+    root@boot2docker:/# cd docker/docs/articles/https
+    root@boot2docker:/# make cert
 
 lots of things to see and manually answer, as openssl wants to be interactive
 
 **NOTE:** make sure you enter the hostname (`boot2docker` in my case) when prompted for `Computer Name`)
 
-    $$ sudo make run
+    root@boot2docker:/# sudo make run
 
 Start another terminal:
 
     $ boot2docker ssh
-    $$ cd docker/docs/articles/https
-    $$ make client
+    root@boot2docker:/# cd docker/docs/articles/https
+    root@boot2docker:/# make client
 
 The last will connect first with `--tls` and then with `--tlsverify`, both should succeed.