gpui: Fix line_through, underline position when used text center or right (#24721)

Release Notes:

- N/A

---

| Before | After |
| --- | --- |
| <img width="912" alt="image"
src="https://github.com/user-attachments/assets/0640ac85-ee5d-4707-b866-997e36608c18"
/> | <img width="912" alt="image"
src="https://github.com/user-attachments/assets/caf84477-a7bc-4c22-a9e6-f44c3b6f86ef"
/> |
 
And fix the `line_through` doc link.

crates/gpui/src/styled.rs

@@ -478,7 +478,7 @@ pub trait Styled: Sized {
     }
 
     /// Sets the font style of the element to normal (not italic).
-    /// [Docs](https://tailwindcss.com/docs/font-style#italicizing-text)
+    /// [Docs](https://tailwindcss.com/docs/font-style#displaying-text-normally)
     fn not_italic(mut self) -> Self {
         self.text_style()
             .get_or_insert_with(Default::default)
@@ -498,7 +498,7 @@ pub trait Styled: Sized {
     }
 
     /// Sets the decoration of the text to have a line through it.
-    /// [Docs](https://tailwindcss.com/docs/text-decoration#setting-the-text-decoration)
+    /// [Docs](https://tailwindcss.com/docs/text-decoration-line#adding-a-line-through-text)
     fn line_through(mut self) -> Self {
         let style = self.text_style().get_or_insert_with(Default::default);
         style.strikethrough = Some(StrikethroughStyle {