message: remove the redundant command
diff: @@ -3447,9 +3447,9 @@ class basic_json
  This overloads is chosen if:
  - @a ValueType is not @ref basic_json,
  - @ref json_serializer<ValueType> has a `from_json()` method of the form
  - `void from_json(const ` @ref basic_json`&, ValueType&)`, and
  + `void from_json(const basic_json&, ValueType&)`, and
  - @ref json_serializer<ValueType> does not have a `from_json()` method of
  - the form `ValueType from_json(const ` @ref basic_json`&)`
  + the form `ValueType from_json(const basic_json&)`
  @tparam ValueTypeCV the provided value type
  @tparam ValueType the returned value type
  @@ -3508,7 +3508,7 @@ class basic_json
  This overloads is chosen if:
  - @a ValueType is not @ref basic_json and
  - @ref json_serializer<ValueType> has a `from_json()` method of the form
  - `ValueType from_json(const ` @ref basic_json`&)`
  + `ValueType from_json(const basic_json&)`
  @note If @ref json_serializer<ValueType> has both overloads of
  `from_json()`, this one is chosen.
  