[Console] Add documentation for QuestionHelper
feature #3752 [Console] Add documentation for QuestionHelper (romainneutron)

This PR was merged into the master branch.

Discussion
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[Console] Add documentation for QuestionHelper

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes (https://github.com/symfony/symfony/pull/10606)
| Applies to    | 2.5+

This is the documentation for the new Question Helper

Commits
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f4ee337 [Console] Add documentation for QuestionHelper