fix 5456 (#5458)

Signed-off-by: David G <david.randommail1@gmail.com>

Author: DavidG-Develop

nav2_behavior_tree/nav2_tree_nodes.xml

@@ -123,7 +123,7 @@
       <input_port name="path">Path to follow</input_port>
       <input_port name="goal_checker_id">Goal checker</input_port>
       <input_port name="progress_checker_id">Progress checker</input_port>
-      <input_port name="service_name">Service name</input_port>
+      <input_port name="server_name">Action server name</input_port>
       <input_port name="server_timeout">Server timeout</input_port>
       <output_port name="error_code_id">Follow Path error code</output_port>
     </Action>