   def concat(docs), do: folddoc(docs, concat(&1, &2))
 
   @doc """
-  Nests document entity x positions deep. Nesting will be
+  Nests document entity `x` positions deep. Nesting will be
   appended to the line breaks.
 
   ## Examples

      iex> Inspect.Algebra.pretty(doc, 80)
      "foo"

  The functions `nest/2`, `space/2` and `line/2` helps you put the
  document together into a rigid structure. However, the document
  algebra gets interesting when using functions like `break/2`, which
  converts the given string into a line break depending on much space
  there is to print. Let's glue two docs together with a break and then
  render it:


  defrecordp :doc_group, :doc_group, [doc: :doc_nil]

  @doc """
  Returns `:doc_nil` which is a document entity used to represent
  nothingness. Takes no arguments.

  ## Examples
