[commands] Update Command documentation (NFC) (#3881)

Add reference to which VendorDep the class is included in.
Add missing OldCommands C++ Documentation (copied from Java).

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

@@ -14,6 +14,8 @@ namespace frc2 {
  * A subsystem that uses a ProfiledPIDController to control an output.  The
  * controller is run synchronously from the subsystem's periodic() method.
  *
+ * This class is provided by the NewCommands VendorDep
+ *
  * @see ProfiledPIDController
  */
 template <class Distance>