message: Fix typo in HMI API
diff: <description>
  A color scheme for all display layout templates.
  </description>
  - <param name="primaryColor" type="RGBColor" mandatory="false">
  + <param name="primaryColor" type="Common.RGBColor" mandatory="false">
  <description>The primary "accent" color</description>
  </param>
  - <param name="secondaryColor" type="RGBColor" mandatory="false">
  + <param name="secondaryColor" type="Common.RGBColor" mandatory="false">
  <description>The secondary "accent" color</description>
  </param>
  - <param name="backgroundColor" type="RGBColor" mandatory="false">
  + <param name="backgroundColor" type="Common.RGBColor" mandatory="false">
  <description>The color of the background</description>
  </param>
  </struct>
  