Merge branch '6.1' into 6.2

* 6.1:
  [Config] Delete a page that it's no longer needed
  [Contributing] Update the footnotes of the BC article
  Minor: Deleting link
  add alternative method to force version with symfony/flex

Author: javiereguiluz

bundles/best_practices.rst

@@ -233,6 +233,8 @@ with Symfony Flex to install a specific Symfony version:
 
     # this requires Symfony 5.x for all Symfony packages
     export SYMFONY_REQUIRE=5.*
+    # alternatively you can run this command to update composer.json config
+    # composer config extra.symfony.require "5.*"
 
     # install Symfony Flex in the CI environment
     composer global config --no-plugins allow-plugins.symfony/flex true

configuration.rst

@@ -775,12 +775,6 @@ the env files ending in ``.local`` (``.env.local`` and ``.env.<environment>.loca
 **should not be committed** because only you will use them. In fact, the
 ``.gitignore`` file that comes with Symfony prevents them from being committed.
 
-.. caution::
-
-    Applications created before November 2018 had a slightly different system,
-    involving a ``.env.dist`` file. For information about upgrading, see:
-    :doc:`configuration/dot-env-changes`.
-
 .. _configuration-env-var-in-prod:
 
 Configuring Environment Variables in Production