Some documentation updates (#4636)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/api/json_pointer/operator_string_t.md

@@ -42,6 +42,10 @@ operator string_t() const
     --8<-- "examples/json_pointer__operator_string_t.output"
     ```
 
+## See also
+
+- [string_t](../basic_json/string_t.md)- type for strings
+
 ## Version history
 
 - Since version 2.0.0.

docs/mkdocs/docs/api/macros/json_assert.md

@@ -79,6 +79,10 @@ Therefore, assertions can be switched off by defining `NDEBUG`.
     assertion error in operator[]
     ```
 
+## See also
+
+- [Runtime Assertions](../../features/assertions.md) - overview documentation
+
 ## Version history
 
 - Added in version 3.9.0.

docs/mkdocs/docs/api/macros/json_diagnostic_positions.md

@@ -108,6 +108,12 @@ When the macro is not defined, the library will define it to its default value.
     ```
     
         The output shows the exception with diagnostic path info and start/end positions.
+
+## See also
+
+- [:simple-cmake: JSON_Diagnostic_Positions](../../integration/cmake.md#json_diagnostic_positions) - CMake option to control the macro
+- [JSON_DIAGNOSTICS](json_diagnostics.md) - macro to control extended diagnostics
+
 ## Version history
 
 - Added in version 3.12.0.

docs/mkdocs/docs/api/macros/json_diagnostics.md

@@ -82,7 +82,12 @@ When the macro is not defined, the library will define it to its default value.
     --8<-- "examples/diagnostic_positions_exception.output"
     ```    
         The output shows the exception with start/end positions only.
-        
+
+## See also
+
+- [:simple-cmake: JSON_Diagnostics](../../integration/cmake.md#json_diagnostics) - CMake option to control the macro
+- [JSON_DIAGNOSTIC_POSITIONS](json_diagnostic_positions.md) - macro to access positions of elements
+
 ## Version history
 
 - Added in version 3.10.0.

docs/mkdocs/docs/api/macros/json_disable_enum_serialization.md

@@ -145,7 +145,9 @@ The default value is `0`.
 
 ## See also
 
-- [`NLOHMANN_JSON_SERIALIZE_ENUM`](nlohmann_json_serialize_enum.md)
+- [:simple-cmake: JSON_DisableEnumSerialization](../../integration/cmake.md#json_disableenumserialization) - CMake option to control
+  the macro
+- [`NLOHMANN_JSON_SERIALIZE_ENUM`](nlohmann_json_serialize_enum.md) - serialize/deserialize an enum
 
 ## Version history
 

docs/mkdocs/docs/api/macros/json_use_global_udls.md

@@ -92,6 +92,7 @@ When the macro is not defined, the library will define it to its default value.
 
 - [`operator""_json`](../operator_literal_json.md)
 - [`operator""_json_pointer`](../operator_literal_json_pointer.md)
+- [:simple-cmake: JSON_GlobalUDLs](../../integration/cmake.md#json_globaludls) - CMake option to control the macro
 
 ## Version history
 

docs/mkdocs/docs/api/macros/json_use_implicit_conversions.md

@@ -53,6 +53,7 @@ By default, implicit conversions are enabled.
 
 - [**operator ValueType**](../basic_json/operator_ValueType.md) - get a value (implicit)
 - [**get**](../basic_json/get.md) - get a value (explicit)
+- [:simple-cmake: JSON_ImplicitConversions](../../integration/cmake.md#json_implicitconversions) - CMake option to control the macro
 
 ## Version history
 

docs/mkdocs/docs/api/macros/json_use_legacy_discarded_value_comparison.md

@@ -72,6 +72,10 @@ When the macro is not defined, the library will define it to its default value.
     ...
     ```
 
+### See also
+
+- [:simple-cmake: JSON_LegacyDiscardedValueComparison](../../integration/cmake.md#json_legacydiscardedvaluecomparison) - CMake option to control the macro
+
 ## Version history
 
 - Added in version 3.11.0.

docs/mkdocs/docs/features/assertions.md

@@ -138,3 +138,7 @@ result in undefined behavior. Since version 3.11.4, this library checks for `nul
     ```
     [json.exception.parse_error.101] parse error: attempting to parse an empty input; check that your input string or stream contains the expected JSON
     ```
+
+## See also
+
+- [JSON_ASSERT](../api/macros/json_assert.md) - control behavior of runtime assertions

docs/mkdocs/docs/features/macros.md

@@ -24,11 +24,26 @@ When enabled, exception messages contain a [JSON Pointer](json_pointer.md) to th
 exception, see [Extended diagnostic messages](../home/exceptions.md#extended-diagnostic-messages) for an example. Note
 that enabling this macro increases the size of every JSON value by one pointer and adds some runtime overhead.
 
-The diagnostics messages can also be controlled with the CMake option `JSON_Diagnostics` (`OFF` by default) which sets
-`JSON_DIAGNOSTICS` accordingly.
+The diagnostics messages can also be controlled with the CMake option
+[`JSON_Diagnostics`](../integration/cmake.md#json_diagnostics) (`OFF` by default) which sets `JSON_DIAGNOSTICS`
+accordingly.
 
 See [full documentation of `JSON_DIAGNOSTICS`](../api/macros/json_diagnostics.md).
 
+## `JSON_DIAGNOSTIC_POSITIONS`
+
+When enabled, two new member functions [`start_pos()`](../api/basic_json/start_pos.md) and
+[`end_pos()`](../api/basic_json/end_pos.md) are added to [`basic_json`](../api/basic_json/index.md) values. If the value
+was created by calling the[`parse`](../api/basic_json/parse.md) function, then these functions allow to query the byte
+positions of the value in the input it was parsed from. The byte positions are also used in exceptions to help locate
+errors.
+
+The diagnostics positions can also be controlled with the CMake option
+[`JSON_Diagnostic_Positions`](../integration/cmake.md#json_diagnostic_positions) (`OFF` by default) which sets
+`JSON_DIAGNOSTIC_POSITIONS` accordingly.
+
+See [full documentation of `JSON_DIAGNOSTIC_POSITIONS`](../api/macros/json_diagnostic_positions.md)
+
 ## `JSON_HAS_CPP_11`, `JSON_HAS_CPP_14`, `JSON_HAS_CPP_17`, `JSON_HAS_CPP_20`
 
 The library targets C++11, but also supports some features introduced in later C++ versions (e.g., `std::string_view`