chore(deps): update dependency ember-cli-addon-docs to v3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli-addon-docs	^2.0.0 -> ^3.0.0

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Release Notes

ember-learn/ember-cli-addon-docs

### [`v3.0.0`](https://togithub.com/ember-learn/ember-cli-addon-docs/blob/master/CHANGELOG.md#v300-2021-05-31) [Compare Source](https://togithub.com/ember-learn/ember-cli-addon-docs/compare/v2.0.0...v3.0.0) ##### :boom: Breaking Change - [#​854](https://togithub.com/ember-learn/ember-cli-addon-docs/pull/854) Drop ember-concurrency 1.x support, fix ember-keyboard deprecations ([@​rwwagner90](https://togithub.com/rwwagner90)) ##### :house: Internal - [#​855](https://togithub.com/ember-learn/ember-cli-addon-docs/pull/855) Ember 3.26 ([@​rwwagner90](https://togithub.com/rwwagner90)) ##### Committers: 2 - Robert Wagner ([@​rwwagner90](https://togithub.com/rwwagner90)) - [@​dependabot-preview\[bot\]](https://togithub.com/apps/dependabot-preview)

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