Land rapid7#9066, add doc for http_version

Land rapid7#9066

Author: wchen-r7

documentation/modules/auxiliary/scanner/http/http_version.md

@@ -0,0 +1,40 @@
+## Description
+
+This module displays the version information about each system.
+
+## Verification Steps
+
+1. Do: ```use auxiliary/scanner/http/http_version```
+2. Do: ```set RHOSTS [IP]```
+3. Do: ```set RPORT [PORT]```
+4. Do: ```run```
+
+## Scenarios
+
+**Running the scanner**
+
+```
+msf > use auxiliary/scanner/http/http_version 
+msf auxiliary(http_version) > show options
+
+Module options (auxiliary/scanner/http/http_version):
+
+   Name     Current Setting  Required  Description
+   ----     ---------------  --------  -----------
+   Proxies                   no        A proxy chain of format type:host:port[,type:host:port][...]
+   RHOSTS                    yes       The target address range or CIDR identifier
+   RPORT    80               yes       The target port (TCP)
+   SSL      false            no        Negotiate SSL/TLS for outgoing connections
+   THREADS  1                yes       The number of concurrent threads
+   VHOST                     no        HTTP server virtual host
+
+msf auxiliary(http_version) > set RHOSTS 192.168.56.101
+RHOSTS => 192.168.56.101
+msf auxiliary(http_version) > run
+
+[+] 192.168.56.101:80 Apache/2.2.8 (Ubuntu) DAV/2 ( Powered by PHP/5.2.4-2ubuntu5.10 )
+[*] Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+
+msf auxiliary(http_version) > 
+```