Update ros2 param dump dosctring. (#837)

"""Dump the parameters of a node to a yaml file.""" -> """Show all of the parameters of a node in a YAML file format."""

Based on the documentation at
https://docs.ros.org/en/rolling/How-To-Guides/Using-ros2-param.html#ros2-param-dump

Signed-off-by: Murilo M. Marinho <[email protected]>

Author: mmmarinho

ros2param/ros2param/verb/dump.py

@@ -29,7 +29,7 @@
 
 
 class DumpVerb(VerbExtension):
-    """Dump the parameters of a node to a yaml file."""
+    """Show all of the parameters of a node in a YAML file format."""
 
     def add_arguments(self, parser, cli_name):  # noqa: D102
         add_arguments(parser)