fix(search): remove stale Slack indexing copy

Author: icecrasher321

apps/sim/ee/credential-groups/components/slack-managed-users-modal.tsx

@@ -424,7 +424,7 @@ export function SlackManagedUsersModal({
                       ? sharedAppNeedsUpdate
                         ? 'Member access is outdated. Update it so members can reconnect their Slack accounts.'
                         : 'The Sim Search installation needs attention. Manage the app to finish setup.'
-                      : 'Verify member authorization for the installed app. Each member can then connect their Slack account to index channels and DMs they can access.'}
+                      : 'Verify member authorization for the installed app. Members can then search the Slack conversations they can access.'}
                   </p>
                   {selectedApp && (
                     <Chip onClick={() => setAppSetupOpen(true)} disabled={pending}>