code: function(doc) {
    if (doc.params) {
      _.each(doc.params, function(param) {
        replaceNewLines(param, 'description');
      });
    }
  
    // Replace new lines in the return and params descriptions.
    var returns = doc.returns;
    if (returns) {
      replaceNewLines(returns, 'description');
    }
  }
docs: Remove the duplicate param annotations. Go through the params and the return
  annotations to replace the new lines and escape the types to prepare them
  for markdown rendering.
  
  @param {!Object} doc Document representing a function jsdoc.