[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

examples/dave_robot_launch/package.xml

@@ -1,18 +1,12 @@
-<?xml version="1.0"?>
-<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
-<package format="3">
-
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?><package format="3">
   <name>dave_robot_launch</name>
   <version>0.1.0</version>
   <description>A package that shows a demo to launch robot models.</description>
-
   <maintainer email="[email protected]">Rakesh Vivekanandan</maintainer>
-
   <license>MIT</license>
-
   <buildtool_depend>ament_cmake</buildtool_depend>
-
   <export>
     <build_type>ament_cmake</build_type>
   </export>
-</package>
+</package>

models/dave_robot_models/package.xml

@@ -1,20 +1,14 @@
-<?xml version="1.0"?>
-<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
-<package format="3">
-
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?><package format="3">
   <name>dave_robot_models</name>
   <version>0.1.0</version>
-  <description> Dave robot model description files are placed here. </description>
-
+  <description>Dave robot model description files are placed here.</description>
   <maintainer email="[email protected]">Rakesh Vivekanandan</maintainer>
-
   <license>MIT</license>
-
   <buildtool_depend>ament_cmake</buildtool_depend>
-
   <export>
     <build_type>ament_cmake</build_type>
     <!-- This doesn't work yet https://github.com/gazebosim/ros_gz/pull/492 -->
     <!-- <gazebo_ros gazebo_model_path="${prefix}/meshes"/> -->
   </export>
-</package>
+</package>

models/dave_worlds/worlds/dave_ocean_waves.world

@@ -113,6 +113,6 @@
         </density_change>
       </graded_buoyancy>
     </plugin>
-  
+
   </world>
 </sdf>