Removed another extra "$" from another command

The command provided under "Verify the Razor Server" is as follows:

```
wget http://${$RAZOR_HOSTNAME}:${RAZOR_PORT}/api -O test.out
```

The output from that is as follows:

```
-bash: http://${$RAZOR_HOSTNAME}:${RAZOR_PORT}/api: bad substitution
```

I changed it to the following, and it seemed to work:

```
wget http://${RAZOR_HOSTNAME}:${RAZOR_PORT}/api -O test.out
```