[11.x] reference url config variable instead of timezone (#10161)

* reference `url` config variable instead of `timezone`

further discourage changing the timezone from the default "UTC" value.

for the uninformed, the previous wording might seem to suggest changing the timezone based on your application is common and/or recommended practice.

* switch away from `timezone` again

Author: browner12

configuration.md

@@ -17,7 +17,7 @@
 
 All of the configuration files for the Laravel framework are stored in the `config` directory. Each option is documented, so feel free to look through the files and get familiar with the options available to you.
 
-These configuration files allow you to configure things like your database connection information, your mail server information, as well as various other core configuration values such as your application timezone and encryption key.
+These configuration files allow you to configure things like your database connection information, your mail server information, as well as various other core configuration values such as your application URL and encryption key.
 
 <a name="the-about-command"></a>
 #### The `about` Command

installation.md

@@ -116,7 +116,7 @@ Once you have started the development server, your application will be accessibl
 
 All of the configuration files for the Laravel framework are stored in the `config` directory. Each option is documented, so feel free to look through the files and get familiar with the options available to you.
 
-Laravel needs almost no additional configuration out of the box. You are free to get started developing! However, you may wish to review the `config/app.php` file and its documentation. It contains several options such as `timezone` and `locale` that you may wish to change according to your application.
+Laravel needs almost no additional configuration out of the box. You are free to get started developing! However, you may wish to review the `config/app.php` file and its documentation. It contains several options such as `url` and `locale` that you may wish to change according to your application.
 
 <a name="environment-based-configuration"></a>
 ### Environment Based Configuration