 
   @doc """
   Logs a debug message.
+  
+  Returns the atom `:ok` or an `{:error, reason}` tuple.
 
   ## Examples
 

  @doc """
  Logs a warning.

  ## Examples

      Logger.warn "knob turned too far to the right"

  @doc """
  Logs an error.

  Returns the atom `:ok` or an `{:error, reason}` tuple.

  ## Examples

      Logger.error "oops"
