Change example URL in unix installation guide (#1119)

Updated example URL for accessing the mapserv file.

Fix #1117

Co-authored-by: Yves Jacolin <660191+yjacolin@users.noreply.github.com>

Author: github-actions[bot]

en/installation/unix.txt

@@ -534,7 +534,7 @@ Testing your new Install
 
 Placing the mapserv file in this directory makes it accessible by the
 following URL:
-"http://yourhostname.com/cgi-bin/mapserv". When accessing this URL through your 
+"http://my-site.localhost/cgi-bin/mapserv". When accessing this URL through your 
 web client, you should expect the following output if all has worked well: 
 "No query information to decode. QUERY_STRING is set, but empty." If you get 
 this message, you're done installing MapServer.