Document app:config:dump config-types argument

[keharper]

This issue is a:

• [ x ] Other (documentation update)

In EngComm PR-12410, contributor @jalogut added the ability to limit the scope of the magento app:config:dump command.

The syntax is now

app:config:dump [<config-types>]
where is a space-separated list of config types [scopes, system, themes, i18n]. If no values are specified, the command dumps all information

The contribution was ported to 2.3

Expected result:

The new argument is documented.

[lorikrell]

Revisiting and pulling together all issues for Pipeline deployment for devdoc updates.

[lorikrell]

Connected to issue #2421. Completing work together, previously completed in 2.2.5. I found the previous commit and reapplying, will ensure it is added to 2.3.

[lorikrell]

Content updated and merged!