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

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

wpilibNewCommands/src/main/native/include/frc2/command/CommandScheduler.h

@@ -209,7 +209,7 @@ class CommandScheduler final : public nt::NTSendable,
    * <p>Commands will be canceled even if they are not scheduled as
    * interruptible.
    *
-   * @param commands the commands to cancel
+   * @param command the command to cancel
    */
   void Cancel(Command* command);
 
@@ -278,7 +278,7 @@ class CommandScheduler final : public nt::NTSendable,
    * that are directly scheduled by the scheduler; it will not work on commands
    * inside of CommandGroups, as the scheduler does not see them.
    *
-   * @param commands the command to query
+   * @param command the command to query
    * @return whether the command is currently scheduled
    */
   bool IsScheduled(const Command* command) const;