[7.4 rc fix] [doc] change nginx config path

王权利请求将github/fork/bbodenmiller/patch-21合并到7-4-stable

Created by: bbodenmiller

Was pointing to wrong path as originally pointed out in https://github.com/gitlabhq/gitlabhq/pull/8043. Replaces https://github.com/gitlabhq/gitlabhq/pull/8043.

合并请求报告