[docs] Fix Doxygen warnings, add CI docs lint job (#3639)

The CI docs lint build is configured to fail on Doxygen warnings.

wpilibc/src/main/native/include/frc/smartdashboard/Mechanism2d.h

@@ -48,6 +48,7 @@ class Mechanism2d : public nt::NTSendable,
    *
    * @param width the width
    * @param height the height
+   * @param backgroundColor the background color
    */
   Mechanism2d(double width, double height,
               const Color8Bit& backgroundColor = {0, 0, 32});