More documentation updates for 3.11.0 (#3553)

* mkdocs: add string_view examples

* mkdocs: reference underlying operators

* mkdocs: add operator<=> examples

* mkdocs: fix style check issues

* mkdocs: tweak BJData page

* mkdocs: add CMake option hints to macros

* mkdocs: fix JSON_DISABLE_ENUM_SERIALIZATION definition

* mkdocs: fix link to unit-udt.cpp

* mkdocs: fix "Arbitrary Type Conversions" title

* mkdocs: link to api/macros/*.md instead of features/macros.md

* mkdocs: document JSON_DisableEnumSerialization CMake option

* mkdocs: encode required C++ standard in example files

* docset: detect gsed/sed

* docset: update index

* docset: fix CSS patching

* docset: add list_missing_pages make target

* docset: add list_removed_paths make target

* docset: replace page titles with name from index

* docset: add install target for Zeal docset browser

* Use GCC_TOOL in ci_test_documentation target

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

@@ -11,9 +11,6 @@ When enabled, exception messages contain a [JSON Pointer](../json_pointer/json_p
 triggered the exception. 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.
-
 ## Default definition
 
 The default value is `0` (extended diagnostics are switched off).
@@ -37,6 +34,12 @@ When the macro is not defined, the library will define it to its default value.
     
     Where possible, it is still recommended that all code define this the same way for maximum interoperability.
 
+!!! hint "CMake option"
+
+    Diagnostic messages can also be controlled with the CMake option
+    [`JSON_Diagnostics`](../../integration/cmake.md#json_diagnostics) (`OFF` by default)
+    which defines `JSON_DIAGNOSTICS` accordingly.
+
 ## Examples
 
 ??? example "Example 1: default behavior"