minor #10972 Update web_server_configuration (jibe0123)

This PR was merged into the 4.2 branch.

Discussion
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Update web_server_configuration

Most of the symfony installation had to install PHP7.2.

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Commits
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c7ee69b Update web_server_configuration

Author: javiereguiluz

setup/web_server_configuration.rst

@@ -288,7 +288,7 @@ The **minimum configuration** to get your application running under Nginx is:
         }
 
         location ~ ^/index\.php(/|$) {
-            fastcgi_pass unix:/var/run/php/php7.1-fpm.sock;
+            fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
             fastcgi_split_path_info ^(.+\.php)(/.*)$;
             include fastcgi_params;