   end
 
   @doc """
-  Returns true if the element on the left is equal (==) to
-  any of the items in the right.
+  Returns `true` if the element on the left is equal (==) to
+  any of the items on the right.
 
   ## Examples
 


      if(foo, do: bar)

  In the example above, bar will be returned if foo evaluates to
  true (i.e. it is not false nor nil). Otherwise, nil will be returned.

  An else option can be given to specify the opposite:

      if(foo, do: bar, else: baz)

  ## Blocks examples

  Elixir also allows you to pass a block to the if macro. The first
  example above would be translated to:

      if foo do
        bar
      end

  Notice that do/end becomes delimiters. The second example would
  then translate do:

      if foo do
        bar

  end

  @doc """
  Deletes the element at the zero-based `index` from `tuple`.

  Please note that in versions of Erlang prior to R16B there is no BIF
  for this operation and it is emulated by converting the tuple to a list
