docs(slack): update slack app scopes and format integration docs#17248

leeandher wants to merge 1 commit intomastergetsentry/sentry-docs:masterfrom

leanderrodrigues/iswf-2351-prepare-docs-for-users-the-new-scopes-we-requiregetsentry/sentry-docs:leanderrodrigues/iswf-2351-prepare-docs-for-users-the-new-scopes-we-requireCopy head branch name to clipboard