Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/console/Tests/Fixtures/command_2.md

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+descriptor:command2
+-------------------
+
+* Description: command 2 description
+* Usage:
+
+  * `descriptor:command2 [-o|--option_name] [--] <argument_name>`
+  * `descriptor:command2 -o|--option_name <argument_name>`
+  * `descriptor:command2 <argument_name>`
+
+command 2 help
+
+### Arguments:
+
+**argument_name:**
+
+* Name: argument_name
+* Is required: yes
+* Is array: no
+* Description: <none>
+* Default: `NULL`
+
+### Options:
+
+**option_name:**
+
+* Name: `--option_name`
+* Shortcut: `-o`
+* Accept value: no
+* Is value required: no
+* Is multiple: no
+* Description: <none>
+* Default: `false`