Improve copy Slack application integration
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=370758) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=370758) </details> <!--IssueSummary end--> ## Problem When user has Slack application integration enabled, the following is shown: (`settings > integrations > slack application`) ![Screen_Shot_2022-08-15_at_16.41.36](/uploads/d0e72213bf24df24c7d1d5a56d0077ce/Screen_Shot_2022-08-15_at_16.41.36.png) * Copy guidelines suggest to not use terminology like `allow` and `enable` * Copy could be shorter and more concise Full context in Figma [comment](https://www.figma.com/file/TU7XWkuFMBX1ODckT89ryT?node-id=31:5157#243409220) ## Solution @ashrafkhamis has suggested to update the copy to the following ``` Perform common actions on this project by entering slash commands in Slack. Learn more. For a list of available commands, enter '/gitlab help'. ```
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