Fix description of the format.skip-magic-trailing-comma example (#19095)

## Summary

This PR fixes a typo in the docs, where both variants of a config have
the same description.

crates/ruff_workspace/src/options.rs

@@ -3587,7 +3587,7 @@ pub struct FormatOptions {
     /// Setting `skip-magic-trailing-comma = true` changes the formatting to:
     ///
     /// ```python
-    /// # The arguments remain on separate lines because of the trailing comma after `b`
+    /// # The arguments are collapsed to a single line because the trailing comma is ignored
     /// def test(a, b):
     ///     pass
     /// ```

ruff.schema.json

@@ -1588,7 +1588,7 @@
           ]
         },
         "skip-magic-trailing-comma": {
-          "description": "Ruff uses existing trailing commas as an indication that short lines should be left separate. If this option is set to `true`, the magic trailing comma is ignored.\n\nFor example, Ruff leaves the arguments separate even though collapsing the arguments to a single line doesn't exceed the line length if `skip-magic-trailing-comma = false`:\n\n```python # The arguments remain on separate lines because of the trailing comma after `b` def test( a, b, ): pass ```\n\nSetting `skip-magic-trailing-comma = true` changes the formatting to:\n\n```python # The arguments remain on separate lines because of the trailing comma after `b` def test(a, b): pass ```",
+          "description": "Ruff uses existing trailing commas as an indication that short lines should be left separate. If this option is set to `true`, the magic trailing comma is ignored.\n\nFor example, Ruff leaves the arguments separate even though collapsing the arguments to a single line doesn't exceed the line length if `skip-magic-trailing-comma = false`:\n\n```python # The arguments remain on separate lines because of the trailing comma after `b` def test( a, b, ): pass ```\n\nSetting `skip-magic-trailing-comma = true` changes the formatting to:\n\n```python # The arguments are collapsed to a single line because the trailing comma is ignored def test(a, b): pass ```",
           "type": [
             "boolean",
             "null"