docs(ingest/sac): add additional permission for SAP Analytics Cloud source to docs

[Masterchen09]

With the quarterly update this weekend SAP changed something on the API permissions, which is why we need one additional permission to be able to use the API for ingestion: Story Listing

Checklist

• [x] The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• [x] Links to related issues (if applicable)
• [x] Tests for the changes have been added/updated (if applicable)
• [x] Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• [x] For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub