message: ADD: Link to example of `<xacro:inertial_props>`
diff: <?xml version="1.0"?>
  <robot xmlns:xacro="http://www.ros.org/wiki/xacro">
  - <!-- ============================================================ -->
  + <!-- ============================================================== -->
  <!-- Macro to add an <interial> tag based on yaml-load properties -->
  <!-- -->
  <!-- name: Name of the robot link (without prefix) -->
  - <!-- inertial: Dictionary of inertia properties -->
  - <!-- ============================================================ -->
  + <!-- inertial: Dictionary of inertia properties (see inertial.yaml) -->
  + <!-- ============================================================== -->
  <xacro:macro name="inertial_props" params="inertial:=^ name:=^">
  <xacro:if value="$(arg gazebo)">
  <xacro:unless value="${name in inertial}">${xacro.warning('No inertia properties defined for: ' + name)}</xacro:unless>
  