Change configuration-guide example

Use an example from a default Rails app (4.2.5) rather than an outdated one in the Configuring Rails Components section.
I picked config.time_zone as it currently is the only 'setting for Rails' left in a default config/application.rb.

I stumbled upon this with investigating autoloading in a legacy app, which still included the example comment "# config.autoload_paths += %W(#{config.root}/extras)". Usually adding app/* directories to autoload_paths isn't necessary, so also finding this example within the current docs was a bit confusing initially.

[ci skip]

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