Correct shebang (#5240)

Signed-off-by: Nils-Christian Iseke <nilsmailiseke@gmail.com>

Author: Nils-ChristianIseke

plugins/ros_checkers.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 from sphinxlint.checkers import checker
 import subprocess
 import yaml

source/Tutorials/Advanced/Discovery-Server/scripts/discovery_packets.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3 discovery_server
+#!/usr/bin/env python3 discovery_server
 
 """Script to count number of rtps packages in a tcpdump capture."""
 import os

sphinx-lint-with-ros

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 
 import plugins.ros_checkers
 import sys