rename demo_keys into demo_keystore along with setup tutorial. (#4464) (#4470)

Signed-off-by: Tomoya.Fujita <[email protected]>
(cherry picked from commit dac8695)

Co-authored-by: Tomoya Fujita <[email protected]>

Author: mergify[bot]

source/Tutorials/Advanced/Security/Examine-Traffic.rst

@@ -141,13 +141,13 @@ Enable encryption for both by setting the security environment variables and run
 .. code-block:: bash
 
   # In terminal 1:
-  export ROS_SECURITY_KEYSTORE=~/sros2_demo/demo_keys
+  export ROS_SECURITY_KEYSTORE=~/sros2_demo/demo_keystore
   export ROS_SECURITY_ENABLE=true
   export ROS_SECURITY_STRATEGY=Enforce
   ros2 run demo_nodes_cpp talker --ros-args --enclave /talker_listener/talker
 
   # In terminal 2:
-  export ROS_SECURITY_KEYSTORE=~/sros2_demo/demo_keys
+  export ROS_SECURITY_KEYSTORE=~/sros2_demo/demo_keystore
   export ROS_SECURITY_ENABLE=true
   export ROS_SECURITY_STRATEGY=Enforce
   ros2 run demo_nodes_cpp listener --ros-args --enclave /talker_listener/listener

source/Tutorials/Advanced/Security/The-Keystore.rst

@@ -207,7 +207,7 @@ Begin with a new terminal session and enable security with the keystore created
 
 .. code-block:: bash
 
-  export ROS_SECURITY_KEYSTORE=~/sros2_demo/demo_keys
+  export ROS_SECURITY_KEYSTORE=~/sros2_demo/demo_keystore
   export ROS_SECURITY_ENABLE=true
   export ROS_SECURITY_STRATEGY=Enforce