message: rpc: Add some doxygen comments to utils
diff: @@ -165,6 +165,10 @@ UniValue JSONRPCTransactionError(TransactionError terr, const std::string& err_s
  }
  }
  +/**
  + * A pair of strings that can be aligned (through padding) with other Sections
  + * later on
  + */
  struct Section {
  Section(const std::string& left, const std::string& right)
  : m_left{left}, m_right{right} {}
  @@ -172,6 +176,10 @@ struct Section {
  const std::string m_right;
  };
  +/**
  + * Keeps track of RPCArgs by transforming them into sections for the purpose
  + * of serializing everything to a single string
  + */
  struct Sections {
  std::vector<Section> m_sections;
  size_t m_max_pad{0};
  @@ -182,12 +190,20 @@ struct Sections {
  m_sections.push_back(s);
  }
  + /**
  + * Serializing RPCArgs depends on the outer type. Only arrays and
  + * dictionaries can be nested in json. The top-level outer type is "named
  + * arguments", a mix between a dictionary and arrays.
  + */
  enum class OuterType {
  ARR,
  OBJ,
  NAMED_ARG, // Only set on first recursion
  };
  + /**
  + * Recursive helper to translate an RPCArg into sections
  + */
  void Push(const RPCArg& arg, const size_t current_indent = 5, const OuterType outer_type = OuterType::NAMED_ARG)
  {
  const auto indent = std::string(current_indent, ' ');
  @@ -241,6 +257,9 @@ struct Sections {
  }
  }
  + /**
  + * Concatenate all sections with proper padding
  + */
  std::string ToString() const
  {
  std::string ret;
  