Docs: Fix invalid JSON syntax in Visual Customizations - Editor Scrollbar and Minimap (#35159)

I was on the [Visual Customiztions - Editor
Scrollbar](https://zed.dev/docs/visual-customization#editor-scrollbar)
section of the docs, and copy and pasted the code block into my personal
Zed settings and saw there was a syntax error.

This is a PR to add a missing comma and fix the syntax error in the
docs.

First time contributing, please let me know if I missed any
steps/important info.

Release Notes:

- N/A
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lowlandghost 2025-07-27 13:56:55 -04:00 committed by GitHub
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commit 2a0aad0aaa
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@ -267,7 +267,7 @@ TBD: Centered layout related settings
"display_in": "active_editor", // Where to show (active_editor, all_editor)
"thumb": "always", // When to show thumb (always, hover)
"thumb_border": "left_open", // Thumb border (left_open, right_open, full, none)
"max_width_columns": 80 // Maximum width of minimap
"max_width_columns": 80, // Maximum width of minimap
"current_line_highlight": null // Highlight current line (null, line, gutter)
},