Commits on Jan 8, 2021

1. Make sure that `ActionView::Helpers::AssetTagHelper.preload_links_hea… …

   …der` `nil` without Rails 6.1 defaults
   
   In rails#39939 we automatically set `Link` header for each stylesheet and script.
   In rails#40882 we  added `config.action_view.preload_links_header` option
   to configure whether `stylesheet_link_tag` and `javascript_include_tag`
   should set automatically `Link` header.
   
   This commit adds test to make sure that it is disabled by default
   for updated apps that haven't adopted new '6.1' defaults.
   Also, added changes to Configuring guide
    - Mentioned this option in "Results of `config.load_defaults`" section
    - Mentioned this option in "Baseline defaults:" section (see ff88113)

   

   bogdanvlviv committed Jan 8, 2021
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