[PATCH] Clarify proxy modules $proxy_host variable content

[Jack Henschel]

Hello,

>From the current documentation it was not immediately obvious (at least
to me and my colleague) that nginx does not set the $proxy_host variable
to the hosts specified in an upstream block, but literally uses the name
used in the proxy_pass directive.

Maxim Dounin has explained to me the reason for this [1], nevertheless I
think it is worthwhile explicitly adding this behavior to the documentation.

Regards
Jack

[1] http://mailman.nginx.org/pipermail/nginx/2018-November/057184.html

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