   end
 
   @doc """
-  Updates the key with the given function. If the key does
+  Updates the `key` with the given function. If the `key` does
   not exist, raises `KeyError`.
 
   ## Examples

  end

  @doc """
  Deletes all entries in the keyword list for a specific key.
  If the key does not exist, returns the keyword list unchanged.
  Use `delete_first` to delete just the first entry in case of
  duplicated keys.


  end

  @doc """
  Fetches the value for a specific `key` and returns it in a tuple.
  If the `key` does not exist, returns `:error`.

  ## Examples

