Fix source highlighting in user defined type macros docs (#4169)

Author: ZeronSix

docs/mkdocs/docs/api/macros/nlohmann_define_type_intrusive.md

@@ -59,7 +59,7 @@ See examples below for the concrete generated code.
 
     Consider the following complete example:
 
-    ```cpp hl_lines="21"
+    ```cpp hl_lines="22"
     --8<-- "examples/nlohmann_define_type_intrusive_macro.cpp"
     ```
 
@@ -80,15 +80,15 @@ See examples below for the concrete generated code.
 
     The macro is equivalent to:
 
-    ```cpp hl_lines="21 22 23 24 25 26 27 28 29 30 31 32 33"
+    ```cpp hl_lines="22 23 24 25 26 27 28 29 30 31 32 33 34"
     --8<-- "examples/nlohmann_define_type_intrusive_explicit.cpp"
     ```
 
 ??? example "Example (2): NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT"
 
     Consider the following complete example:
 
-    ```cpp hl_lines="21"
+    ```cpp hl_lines="22"
     --8<-- "examples/nlohmann_define_type_intrusive_with_default_macro.cpp"
     ```
 
@@ -108,7 +108,7 @@ See examples below for the concrete generated code.
 
     The macro is equivalent to:
 
-    ```cpp hl_lines="21 22 23 24 25 26 27 28 29 30 31 32 33 34"
+    ```cpp hl_lines="21 22 23 24 25 26 27 28 29 30 31 32 33 34 35"
     --8<-- "examples/nlohmann_define_type_intrusive_with_default_explicit.cpp"
     ```
 

docs/mkdocs/docs/api/macros/nlohmann_define_type_non_intrusive.md

@@ -60,7 +60,7 @@ See examples below for the concrete generated code.
 
     Consider the following complete example:
 
-    ```cpp hl_lines="15"
+    ```cpp hl_lines="16"
     --8<-- "examples/nlohmann_define_type_non_intrusive_macro.cpp"
     ```
 
@@ -80,15 +80,15 @@ See examples below for the concrete generated code.
 
     The macro is equivalent to:
 
-    ```cpp hl_lines="15 16 17 18 19 20 21 22 23 24 25 26 27"
+    ```cpp hl_lines="16 17 18 19 20 21 22 23 24 25 26 27 28"
     --8<-- "examples/nlohmann_define_type_non_intrusive_explicit.cpp"
     ```
 
 ??? example "Example (2): NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT"
 
     Consider the following complete example:
 
-    ```cpp hl_lines="20"
+    ```cpp hl_lines="21"
     --8<-- "examples/nlohmann_define_type_non_intrusive_with_default_macro.cpp"
     ```
 
@@ -109,7 +109,7 @@ See examples below for the concrete generated code.
 
     The macro is equivalent to:
 
-    ```cpp hl_lines="20 21 22 23 24 25 26 27 28 29 30 31 32 33"
+    ```cpp hl_lines="21 22 23 24 25 26 27 28 29 30 31 32 33 34"
     --8<-- "examples/nlohmann_define_type_non_intrusive_with_default_explicit.cpp"
     ```