Revert "Support relative line number on wrapped lines (#39268)" (#41450)

Closes #41422

This completely broke line numbering as described in the linked issue
and scrolling up does not have the correct numbers any more.

Release Notes:

- NOTE: The `relative_line_numbers` change
(https://github.com/zed-industries/zed/pull/39268) was reverted and did
not make the release cut!

docs/src/configuring-zed.md

@@ -2994,33 +2994,11 @@ List of `string` glob patterns
 
 - Description: Whether to show relative line numbers in the gutter
 - Setting: `relative_line_numbers`
-- Default: `"disabled"`
+- Default: `false`
 
 **Options**
 
-1. Show relative line numbers in the gutter whilst counting wrapped lines as one line:
-
-```json [settings]
-{
-  "relative_line_numbers": "enabled"
-}
-```
-
-2. Show relative line numbers in the gutter, including wrapped lines in the counting:
-
-```json [settings]
-{
-  "relative_line_numbers": "wrapped"
-}
-```
-
-2. Do not use relative line numbers:
-
-```json [settings]
-{
-  "relative_line_numbers": "disabled"
-}
-```
+`boolean` values
 
 ## Remove Trailing Whitespace On Save