[Doc] Drupal 8 nginx snippet

[sticky-note]

This commit f6e54f7 introduces bug as it makes web server to respond 404 to urls matching

/.*entries.*
/.*repository.*
/.*root.*
/.*tag.*
/.*template.*
/.*composer\.(json|lock).*

Drupal can have urls cointaing this subword in other urls and I think this behaviour is not intended
Previous version of this file already prevent access to web.config, composer.lock and composer.json

Please correct it as it is official documentation

[alessfg]

Can you create a PR? The wiki is 100% community supported.

[doublecompile]

I've added a pull request using the regular expression present in the latest version of .htaccess from Drupal (i.e. drupal/drupal@952c086)