fix(batch-changes): repair broken permissions table (#1770)

## What

Fixes the broken table under "Batch Change access for each permission
level" on
`/batch-changes/permissions-in-batch-changes`. Previously the table
rendered as a
single paragraph with literal `|` separators visible to the reader.


## Currently at Permissions in Batch Changes

You can see the page
[here](https://sourcegraph.com/docs/batch-changes/permissions-in-batch-changes#permissions-in-batch-changes)

<img width="754" height="590" alt="image"
src="https://github.com/user-attachments/assets/9dafe43f-4737-4360-8af9-b17f38ecc5dc"
/>

## After (locally)

<img width="757" height="794" alt="image"
src="https://github.com/user-attachments/assets/837b94e1-45fc-4166-be66-bca2dca649ef"
/>


## Why

The markdown was malformed in two ways:

1. There was a blank line between the header row and the `|---|`
separator row.
GFM requires the separator to be on the line immediately after the
header,
   otherwise the whole block falls back to a paragraph.
2. The rows were missing leading/trailing `|` pipes, unlike every other
table in
   the repo.

## How

Rewrote the table using the standard pipe-delimited form already used
elsewhere
in the docs (e.g., `docs/tutorials/index.mdx`). No content changes — the
actions
and ✅/❌ values are identical to the previous source.

## Test plan

- `pnpm run dev` and visit `/batch-changes/permissions-in-batch-changes`
- Confirm the "Batch Change access for each permission level" section
renders
as a real table with three columns (Batch change action / Read / Admin)
- Confirm no other pages are affected (only this one file changed)

Author: eugenio-sanchez-sg

docs/batch-changes/permissions-in-batch-changes.mdx

@@ -30,21 +30,20 @@ Batch changes can be created under the user's or an organization's namespace. If
 
 The following table shows the access for each permission level for a batch change.
 
-                                                                         **Batch change action**                                                                          | **Read** | **Admin**
-
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :------: | :-------:
-View batch change name and description<br/>(Also shows input branch name, create/update dates, and batch change status) | ✅ | ✅
-View burndown chart (aggregate changeset statuses over time) | ✅ | ✅
-View list of patches and changesets | ✅ | ✅
-View `diffstat` (aggregate count of added/changed/deleted lines) | ✅ | ✅
-View error messages (related to creating or syncing changesets) | ❌ | ✅
-Edit batch change name, description, and branch name | ❌ | ✅
-Update batch change patches (and changesets on code hosts) | ❌ | ✅
-Publish changesets to code host | ❌ | ✅
-Add/remove existing changesets to/from batch change | ❌ | ✅
-Refresh changeset statuses | ❌ | ✅
-Close batch change | ❌ | ✅
-Delete batch change | ❌ | ✅
+| **Batch change action** | **Read** | **Admin** |
+| ----------------------- | :------: | :-------: |
+| View batch change name and description<br/>(Also shows input branch name, create/update dates, and batch change status) | ✅ | ✅ |
+| View burndown chart (aggregate changeset statuses over time) | ✅ | ✅ |
+| View list of patches and changesets | ✅ | ✅ |
+| View `diffstat` (aggregate count of added/changed/deleted lines) | ✅ | ✅ |
+| View error messages (related to creating or syncing changesets) | ❌ | ✅ |
+| Edit batch change name, description, and branch name | ❌ | ✅ |
+| Update batch change patches (and changesets on code hosts) | ❌ | ✅ |
+| Publish changesets to code host | ❌ | ✅ |
+| Add/remove existing changesets to/from batch change | ❌ | ✅ |
+| Refresh changeset statuses | ❌ | ✅ |
+| Close batch change | ❌ | ✅ |
+| Delete batch change | ❌ | ✅ |
 
 <Callout type="note">
 	Authorization for all actions is also subject to [repository