rustdoc: Fix errors in components and ports (#31654)

* Fixed warnings in components/gfx/text/shaping/harfbuzz-rs  components/layout_2020/fragment_tree  ports/servoshell/minibrowser.rs

* Fixed warnings in components/gfx/text/shaping/harfbuzz-rs  components/layout_2020/fragment_tree  ports/servoshell/minibrowser.rs.

* Update minibrowser.rs

Returned "if" back to "iff"

* Update minibrowser.rs

Changed ```BrowserManager``` to ```WebViewManager```

* Update fragment.rs

Changed ```[SequentialLayoutState]``` to ```[crate::flow::float::SequentialLayoutState]```

* Update fragment.rs

Balanced the length of paragraph lines in fragment.rs

* Fix tidy errors

---------

Co-authored-by: Martin Robinson <mrobinson@igalia.com>

components/gfx/text/shaping/harfbuzz.rs

@@ -47,7 +47,7 @@ pub struct ShapedGlyphEntry {
 }
 
 impl ShapedGlyphData {
-    /// Create a new [`SharedGlyphData`] from the given HarfBuzz buffer.
+    /// Create a new [`ShapedGlyphData`] from the given HarfBuzz buffer.
     ///
     /// # Safety
     ///

components/layout_2020/fragment_tree/fragment.rs

@@ -29,9 +29,9 @@ pub(crate) enum Fragment {
     Box(BoxFragment),
     /// Floating content. A floated fragment is very similar to a normal
     /// [BoxFragment] but it isn't positioned using normal in block flow
-    /// positioning rules (margin collapse, etc). Instead, they are laid out by
-    /// the [SequentialLayoutState] of their float containing block formatting
-    /// context.
+    /// positioning rules (margin collapse, etc). Instead, they are laid
+    /// out by the [crate::flow::float::SequentialLayoutState] of their
+    /// float containing block formatting context.
     Float(BoxFragment),
     Positioning(PositioningFragment),
     /// Absolute and fixed position fragments are hoisted up so that they

components/layout_2020/fragment_tree/positioning_fragment.rs

@@ -14,7 +14,7 @@ use crate::cell::ArcRefCell;
 use crate::geom::{LogicalRect, PhysicalRect};
 
 /// Can contain child fragments with relative coordinates, but does not contribute to painting
-/// itself. [`PositioningFragments`] may be completely anonymous, or just non-painting Fragments
+/// itself. [`PositioningFragment`]s may be completely anonymous, or just non-painting Fragments
 /// generated by boxes.
 #[derive(Serialize)]
 pub(crate) struct PositioningFragment {

ports/servoshell/minibrowser.rs

@@ -295,7 +295,7 @@ impl Minibrowser {
         }
     }
 
-    /// Updates the location field from the given [BrowserManager], unless the user has started
+    /// Updates the location field from the given [WebViewManager], unless the user has started
     /// editing it without clicking Go, returning true iff it has changed (needing an egui update).
     pub fn update_location_in_toolbar(
         &mut self,