## Summary
Adds explanations for what each type of scrollbar indicator visually
represents in the editor.
## Description
This PR addresses the issue where users didn't understand what the
colored marks on the scrollbar mean. The existing documentation
explained how to toggle each type of mark on/off, but didn't explain
what they actually represent.
This adds a brief, clear explanation after each scrollbar indicator
setting describing what that indicator shows (e.g., "Git diff indicators
appear as colored marks showing lines that have been added, modified, or
deleted compared to the git HEAD").
## Fixes
Closes#31794
## Test Plan
- Documentation follows the existing style and format of
`docs/src/configuring-zed.md`
- Each explanation is concise and immediately follows the setting
description
- Language is clear and user-friendly
Release Notes:
- N/A
44d91c1709