Address review comments on the theme module

* Rename `StyleProvider::theme_type_id` to `type_id`
* Reword the `Ui::widget_style` docstring

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

crates/egui/src/theme/mod.rs

@@ -12,9 +12,8 @@ use crate::{
 };
 
 impl Ui {
-    /// Access the register theme and fetch the requested [`WidgetStyle`].
-    ///
-    /// Requested widget style must implement [`WidgetStyle`].
+    /// The style of the widget with the given [`crate::Id`] and [`Classes`],
+    /// as computed by the registered theme.
     pub fn widget_style<S: WidgetStyle + Clone + 'static>(
         &self,
         id: crate::Id,

crates/egui/src/theme/style_provider.rs

@@ -7,8 +7,8 @@ pub trait StyleProvider<S> {
     /// The style according to the classes and state of the widget
     fn style(&mut self, modifiers: &StyleArgs<'_>) -> S;
 
-    /// Help to differ the different themes
-    fn theme_type_id(&self) -> TypeId
+    /// Used to tell different themes apart
+    fn type_id(&self) -> TypeId
     where
         Self: 'static,
     {

crates/egui/src/theme/themes.rs

@@ -73,7 +73,7 @@ impl Themes {
             && self
                 .themes
                 .get_temp::<ThemeWrap<S>>(Id::NULL)
-                .is_some_and(|t| t.lock().theme_type_id() == theme.theme_type_id())
+                .is_some_and(|t| t.lock().type_id() == theme.type_id())
         {
             return;
         }