Docker - remove needless proxy_http_version 1.1;

[osokin]

Describe the bug

Remove needless proxy_http_version 1.1; configuration line.

To reproduce

Steps to reproduce the behavior:

1. Ppen https://docs.nginx.com/waf/install/docker/
2. View output
3. See error

Expected behavior

The proxy_http_version 1.1; makes no any sense when it's using without other directives, described for the keepalive case, see the following link for details: https://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive

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.