Fixed the log path on fail2ban page (#13726)

* Changed path from /home/git/gitea/log/gitea.log to
  /var/lib/gitea/log/gitea.log on the fail2ban page, so the log matches
  the instructions found on the following binary installation page:
  https://docs.gitea.io/en-us/install-from-binary/#create-required-directory-structure

docs/content/doc/usage/fail2ban-setup.en-us.md

@@ -41,7 +41,7 @@ Add our jail in `/etc/fail2ban/jail.d/gitea.conf`:
 [gitea]
 enabled = true
 filter = gitea
-logpath = /home/git/gitea/log/gitea.log
+logpath = /var/lib/gitea/log/gitea.log
 maxretry = 10
 findtime = 3600
 bantime = 900