docs: various fixes

Closes https://github.com/tree-sitter/tree-sitter/issues/1317.
Closes https://github.com/tree-sitter/tree-sitter/issues/1752.
Closes https://github.com/tree-sitter/tree-sitter/issues/2439.

Co-authored-by: Simon Hengel <sol@typeful.net>
Co-authored-by: Akash Yadav <itsaky01@gmail.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Laytan Laats <laytanlaats@hotmail.com>

cli/src/generate/build_tables/item_set_builder.rs

@@ -69,7 +69,7 @@ impl<'a> ParseItemSetBuilder<'a> {
         }
 
         // The FIRST set of a non-terminal `i` is the union of the following sets:
-        // * the set of all terminals that appear at the beginings of i's productions
+        // * the set of all terminals that appear at the beginnings of i's productions
         // * the FIRST sets of all the non-terminals that appear at the beginnings
         //   of i's productions
         //

cli/src/tests/parser_hang_test.rs

@@ -14,7 +14,7 @@ use tree_sitter::Parser;
 // The `sanitizing` cfg is required to don't run tests under specific sunitizer
 // because they don't work well with subprocesses _(it's an assumption)_.
 //
-// Bellow are two alternative examples of how to disable tests for some arches
+// Below are two alternative examples of how to disable tests for some arches
 // if a way with excluding the whole mod from compilation wouldn't work well.
 //
 // XXX: Also may be it makes sense to keep such tests as ignored by default

cli/src/tests/tree_test.rs

@@ -44,7 +44,7 @@ fn test_tree_edit() {
     }
 
     // edit starting in the tree's padding but extending into its content:
-    // shrink the content to compenstate for the expanded padding.
+    // shrink the content to compensate for the expanded padding.
     {
         let mut tree = tree.clone();
         tree.edit(&InputEdit {