Clarify node parameters docs (ros2#1631)

Set and initialize seem redundant.
Update the doc brief to match the equivalent in node.hpp.

Signed-off-by: Jacob Perron <[email protected]>

Author: jacobperron

rclcpp/include/rclcpp/node_interfaces/node_parameters_interface.hpp

@@ -130,7 +130,7 @@ class NodeParametersInterface
   std::vector<rcl_interfaces::msg::SetParametersResult>
   set_parameters(const std::vector<rclcpp::Parameter> & parameters) = 0;
 
-  /// Set and initialize a parameter, all at once.
+  /// Set one or more parameters, all at once.
   /**
    * \sa rclcpp::Node::set_parameters_atomically
    */