Update issue_template.md

Use 2.2 link

issue_template.md

@@ -40,7 +40,7 @@ logs.
 
 1. Output of `owncloud --logwindow` or `owncloud --logfile log.txt`
 (On Windows using `cmd.exe`, you might need to first `cd` into the ownCloud directory)
-(See also http://doc.owncloud.org/desktop/1.8/troubleshooting.html#client-logfile )
+(See also http://doc.owncloud.org/desktop/2.2/troubleshooting.html#client-logfile )
 
 2. Web server error log: