Fix typos in macros documentation

Signed-off-by: kimci86 <[email protected]>

Author: kimci86

docs/mkdocs/docs/features/arbitrary_types.md

@@ -89,10 +89,10 @@ There are six macros to make your life easier as long as you (1) want to use a J
 
 - [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_non_intrusive.md) is to be defined inside the namespace of the class/struct to create code for. It will throw an exception in `from_json()` due to a missing value in the JSON object.
 - [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_non_intrusive.md) is to be defined inside the namespace of the class/struct to create code for. It will not throw an exception in `from_json()` due to a missing value in the JSON object, but fills in values from object which is default-constructed by the type.
-- [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_non_intrusive.md) is to be defined inside the namespace of the class/struct to create code for. It does not define a `fron_json()` function which is needed in case the type does not have a default constructor.
+- [`NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_non_intrusive.md) is to be defined inside the namespace of the class/struct to create code for. It does not define a `from_json()` function which is needed in case the type does not have a default constructor.
 - [`NLOHMANN_DEFINE_TYPE_INTRUSIVE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_intrusive.md) is to be defined inside the class/struct to create code for. This macro can also access private members. It will throw an exception in `from_json()` due to a missing value in the JSON object.
 - [`NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_intrusive.md) is to be defined inside the class/struct to create code for. This macro can also access private members. It will not throw an exception in `from_json()` due to a missing value in the JSON object, but fills in values from object which is default-constructed by the type.
-- [`NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_intrusive.md) is to be defined inside the class/struct to create code for. This macro can also access private members. It does not define a `fron_json()` function which is needed in case the type does not have a default constructor.
+- [`NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE(name, member1, member2, ...)`](../api/macros/nlohmann_define_type_intrusive.md) is to be defined inside the class/struct to create code for. This macro can also access private members. It does not define a `from_json()` function which is needed in case the type does not have a default constructor.
 
 Furthermore, there exist versions to use in case of derived classes: