Rollup merge of #43891 - Fourchaux:master, r=steveklabnik

Fix typos & us spellings

Fixing some typos and non en-US spellings.

(Update of PR https://github.com/rust-lang/rust/pull/42812 )

src/librustdoc/html/toc.rs

@@ -95,7 +95,7 @@ impl TocBuilder {
     /// self.top_level, D is in C.children, and C, E, F, G are in
     /// self.chain.
     ///
-    /// When we attempt to push H, we realise that first G is not the
+    /// When we attempt to push H, we realize that first G is not the
     /// parent (level is too high) so it is popped from chain and put
     /// into F.children, then F isn't the parent (level is equal, aka
     /// sibling), so it's also popped and put into E.children.