Docker - remove a trailing slash

[osokin]

Describe the bug

A trailing slash proxy_pass http://127.0.0.1:8080/; in the default.conf configuration files doesn't make any sense.

To reproduce

Steps to reproduce the behavior:

1. Open https://docs.nginx.com/waf/install/docker/
2. View output
3. Scroll down to https://docs.nginx.com/waf/install/docker/#update-configuration-files-1
4. Clock on default.conf tab
5. See error

Expected behavior

Remove a trailing slash proxy_pass http://127.0.0.1:8080/; since it doesn't make any sense.

Your environment

macOS/Chrome

Additional context

No any other context about the problem here.

Sensitive Information

No any sensitive information such as authentication credentials or license keys.