)

## What & why

Page 9852 (Effective Permissions) was missing a teaching tip, so users
opening the page got no in-product explanation of what "effective
permissions" are or how to use them. This adds the page-level
`AboutTitle` and `AboutText` properties so the page shows a teaching
tip, consistent with the sibling permission pages (e.g. Permission Set
by User, Permissions Overview, Permission Sets).

## Linked work

Fixes
[AB#638696](https://dynamicssmb2.visualstudio.com/1fcb79e7-ab07-432a-a3c6-6cf5a88ba4a5/_workitems/edit/638696)

## How I validated this

- [x] I read the full diff and it contains only changes I intended.
- [x] I built the affected file locally with no new analyzer warnings.
- [ ] I ran the change in Business Central and confirmed it behaves as
expected.
- [x] I added or updated tests for the new behavior, or explained below
why none are needed.

**What I tested and the outcome**

- Change is limited to two static page metadata properties
(`AboutTitle`/`AboutText`) on page 9852, mirroring the exact pattern
used by neighboring pages in `System/Permissions`.
- Verified with the AL compiler (`al_getdiagnostics`) that
`EffectivePermissions.Page.al` compiles with **0 errors and 0 new
warnings** after the change. The only diagnostic on the file is a
pre-existing warning about `SourceTable = Permission` being marked for
removal, which is unrelated to this change.
- No tests added: teaching tips are static UI metadata
(`AboutTitle`/`AboutText`) with no logic to exercise, and sibling
permission pages that define the same properties have no dedicated
tests.

## Risk & compatibility

None. This is a metadata-only addition of a teaching tip; there is no
behavioral, data, permission, or upgrade impact. The strings are
translatable and will be picked up by the standard translation
extraction.

Copilot-Session: d77332c6-59ac-4ca4-b8f3-342b6baa5d33