Document the comparisons of json_view

- API pages for operator== and operator!= of basic_json_view, linked
  both ways with the basic_json pages
- the feature page and the class overview list the comparisons
- the examples show when the view helps: detecting a changed document
  without building json values

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

docs/mkdocs/docs/api/basic_json/operator_eq.md

@@ -166,6 +166,8 @@ Linear.
 
 - [operator!=](operator_ne.md) compare for inequality
 - [operator<=>](operator_spaceship.md) comparison: 3-way (C++20)
+- [basic_json_view::operator==](../basic_json_view/operator_eq.md) - the same comparison on a zero-copy view, without
+  building a `basic_json` value for it
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/operator_ne.md

@@ -89,6 +89,12 @@ Linear.
     --8<-- "examples/operator__notequal__nullptr_t.output"
     ```
 
+## See also
+
+- [operator==](operator_eq.md) compare for equality
+- [basic_json_view::operator!=](../basic_json_view/operator_ne.md) - the same comparison on a zero-copy view, without
+  building a `basic_json` value for it
+
 ## Version history
 
 1. Added in version 1.0.0. Added C++20 member functions in version 3.11.0. Changed in version 3.13.0 to remove