message: [dbus] fix "parser error : StartTag: invalid element name"
diff: <!-- RadioSpinelMetrics: The radio spinel metrics
  <literallayout>
  struct {
  - uint32_t mRcpTimeoutCount; ///< The number of RCP timeouts.
  - uint32_t mRcpUnexpectedResetCount; ///< The number of RCP unexcepted resets.
  - uint32_t mRcpRestorationCount; ///< The number of RCP restorations.
  - uint32_t mSpinelParseErrorCount; ///< The number of spinel frame parse errors.
  + uint32_t mRcpTimeoutCount; // The number of RCP timeouts.
  + uint32_t mRcpUnexpectedResetCount; // The number of RCP unexcepted resets.
  + uint32_t mRcpRestorationCount; // The number of RCP restorations.
  + uint32_t mSpinelParseErrorCount; // The number of spinel frame parse errors.
  }
  </literallayout>
  -->
  <!-- RcpInterfaceMetrics: The RCP interface metrics
  <literallayout>
  struct {
  - uint8_t mRcpInterfaceType; ///< The RCP interface type.
  - uint64_t mTransferredFrameCount; ///< The number of transferred frames.
  - uint64_t mTransferredValidFrameCount; ///< The number of transferred valid frames.
  - uint64_t mTransferredGarbageFrameCount; ///< The number of transferred garbage frames.
  - uint64_t mRxFrameCount; ///< The number of received frames.
  - uint64_t mRxFrameByteCount; ///< The number of received bytes.
  - uint64_t mTxFrameCount; ///< The number of transmitted frames.
  - uint64_t mTxFrameByteCount; ///< The number of transmitted bytes.
  + uint8_t mRcpInterfaceType; // The RCP interface type.
  + uint64_t mTransferredFrameCount; // The number of transferred frames.
  + uint64_t mTransferredValidFrameCount; // The number of transferred valid frames.
  + uint64_t mTransferredGarbageFrameCount; // The number of transferred garbage frames.
  + uint64_t mRxFrameCount; // The number of received frames.
  + uint64_t mRxFrameByteCount; // The number of received bytes.
  + uint64_t mTxFrameCount; // The number of transmitted frames.
  + uint64_t mTxFrameByteCount; // The number of transmitted bytes.
  }
  </literallayout>
  -->
  