message: elle: fix doc style
diff: @@ -10,7 +10,7 @@ namespace elle
  {
  /// A range of integers, defined by its beginning and size.
  ///
  - /// \code{.cc}
  + /// @code{.cc}
  ///
  /// IntRange x{10, 100}; // 10..109 (from 10 with 100 entries)
  /// assert(x.begin() == 10);
  @@ -18,7 +18,7 @@ namespace elle
  /// assert(x.contains(50));
  /// assert(x.contains({20, 30})); // Contains the range {20, 21, ..., 48, 49};
  ///
  - /// \endcode
  + /// @endcode
  class IntRange
  {
  /*-------------.
  @@ -117,7 +117,7 @@ namespace elle
  /// A collection of `IntRange`s.
  ///
  - /// \code{.cc}
  + /// @code{.cc}
  ///
  /// auto ranges = elle::IntRanges{{
  /// elle::IntRange{0, 5},
  @@ -130,7 +130,7 @@ namespace elle
  /// std::cout << range;
  /// // Result: (0, 5)(10, 5)
  ///
  - /// \endcode
  + /// @endcode
  class IntRanges
  {
  public:
  