Improve copy Slack application integration

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Problem

When user has Slack application integration enabled, the following is shown: (settings > integrations > slack application)

• Copy guidelines suggest to not use terminology like allow and enable
• Copy could be shorter and more concise

Full context in Figma comment

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'.