Fix typos in librustdoc

Author: DaniPopes

src/librustdoc/clean/types.rs

@@ -2019,7 +2019,7 @@ impl Variant {
 
 #[derive(Clone, Debug)]
 pub(crate) struct Discriminant {
-    // In the case of cross crate re-exports, we don't have the nessesary information
+    // In the case of cross crate re-exports, we don't have the necessary information
     // to reconstruct the expression of the discriminant, only the value.
     pub(super) expr: Option<BodyId>,
     pub(super) value: DefId,

src/librustdoc/config.rs

@@ -230,7 +230,7 @@ pub(crate) struct RenderOptions {
     pub(crate) extension_css: Option<PathBuf>,
     /// A map of crate names to the URL to use instead of querying the crate's `html_root_url`.
     pub(crate) extern_html_root_urls: BTreeMap<String, String>,
-    /// Whether to give precedence to `html_root_url` or `--exten-html-root-url`.
+    /// Whether to give precedence to `html_root_url` or `--extern-html-root-url`.
     pub(crate) extern_html_root_takes_precedence: bool,
     /// A map of the default settings (values are as for DOM storage API). Keys should lack the
     /// `rustdoc-` prefix.

src/librustdoc/html/format.rs

@@ -349,10 +349,10 @@ pub(crate) fn print_where_clause<'a, 'tcx: 'a>(
             let mut br_with_padding = String::with_capacity(6 * indent + 28);
             br_with_padding.push_str("\n");
 
-            let padding_amout =
+            let padding_amount =
                 if ending == Ending::Newline { indent + 4 } else { indent + "fn where ".len() };
 
-            for _ in 0..padding_amout {
+            for _ in 0..padding_amount {
                 br_with_padding.push_str(" ");
             }
             let where_preds = where_preds.to_string().replace('\n', &br_with_padding);

src/librustdoc/html/render/print_item.rs

@@ -1796,10 +1796,11 @@ fn render_struct(
     }
     match ty {
         None => {
-            let where_diplayed = g.map(|g| print_where_clause_and_check(w, g, cx)).unwrap_or(false);
+            let where_displayed =
+                g.map(|g| print_where_clause_and_check(w, g, cx)).unwrap_or(false);
 
             // If there wasn't a `where` clause, we add a whitespace.
-            if !where_diplayed {
+            if !where_displayed {
                 w.write_str(" {");
             } else {
                 w.write_str("{");