Removed an extra "$" from a 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
'''
Merge pull request #421 from psoloway/master

Removed an extra "$" from a command