   ## AST representation
 
   Only two-item tuples are considered literals in Elixir and return themselves
-  when quoted. Therefore all other tuples are represented in the AST as calls to
+  when quoted. Therefore, all other tuples are represented in the AST as calls to
   the `:{}` special form.
 
       iex> quote do

            :infinity
        end

  However when an else clause is present but the result of the expression
  does not match any of the patterns an exception will be raised. This
  exception will not be caught by a catch or rescue in the same try:


          :error_b
      end

  Similarly, an exception inside an else clause is not caught or rescued
  inside the same try:

      try do
