fix: Markdown tables don't render properly in help centre (#13971)

# Pull Request Template

## Description

This PR fixes an issue where markdown tables were not rendering
correctly in the Help Center.

The issue was caused by a backslash `(\)` being appended after table row
separators `(|)`, which breaks the markdown table parsing.

The issue was introduced after recent editor changes made to preserve
new lines, which unintentionally affected how table markdown is parsed
and displayed.

### https://github.com/chatwoot/prosemirror-schema/pull/44

Fixes
https://linear.app/chatwoot/issue/CW-6714/markdown-tables-dont-render-properly-in-help-centre-preview

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

**Before**
```
| Type         | What you provide              |\
|--------------|-------------------------------|\
| None         | No authentication             |\
| Bearer Token | A token string                |\
| Basic Auth   | Username and password         |\
| API Key      | A custom header name and value|
```

**After**
```
| Type         | What you provide              | 
|--------------|-------------------------------| 
| None         | No authentication             | 
| Bearer Token | A token string                | 
| Basic Auth   | Username and password         | 
| API Key      | A custom header name and value|
```




## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

package.json

@@ -34,7 +34,7 @@
     "@amplitude/analytics-browser": "^2.11.10",
     "@breezystack/lamejs": "^1.2.7",
     "@chatwoot/ninja-keys": "1.2.3",
-    "@chatwoot/prosemirror-schema": "1.3.8",
+    "@chatwoot/prosemirror-schema": "1.3.9",
     "@chatwoot/utils": "^0.0.52",
     "@formkit/core": "^1.7.2",
     "@formkit/vue": "^1.7.2",