Address the review of json_view element access

From gregmarr's review of #5622:

- count() counts every member with the key, so count(key) > 1 detects
  duplicate keys; it was contains() as 0/1 before.
- get_to() passes types that get<T>() does not convert directly to
  from_json with the existing value, as basic_json::get_to() does, so that
  a from_json which sets only the fields present keeps the others.
- array_index() checks the empty token and "-" first; the results are
  unchanged.
- Docs: no "if an exception is thrown" where a view never changes
  anything; the borrowed source must also stay unmodified; items() on a
  temporary view is safe; back()/front() notes shortened; the basic_json
  see-also entries say how the view's results can differ.

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

docs/mkdocs/docs/api/basic_json/find.md

@@ -93,7 +93,8 @@ Logarithmic in the size of the JSON object.
 
 - [count](count.md) returns the number of occurrences of a key
 - [contains](contains.md) checks whether a key exists
-- [basic_json_view::find](../basic_json_view/find.md) - the same lookup on a zero-copy view
+- [basic_json_view::find](../basic_json_view/find.md) - the same lookup on a zero-copy view (a duplicate key resolves
+  to the first member, whereas `parse()` keeps the last)
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/front.md

@@ -51,7 +51,8 @@ Constant.
 ## See also
 
 - [back](back.md) to access the last element
-- [basic_json_view::front](../basic_json_view/front.md) - the same access on a zero-copy view
+- [basic_json_view::front](../basic_json_view/front.md) - the same access on a zero-copy view (document order, not
+  sorted; duplicate keys are visited)
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/items.md

@@ -100,7 +100,7 @@ When iterating over an array, `key()` will return the index of the element as st
 - [begin](begin.md) returns an iterator to the first element
 - [end](end.md) returns an iterator to one past the last element
 - [basic_json_view::items](../basic_json_view/items.md) - the same range on a zero-copy view (`#!cpp const auto`,
-  not `#!cpp const auto&`: items are produced on the fly)
+  not `#!cpp const auto&`: items are produced on the fly; document order, not sorted; duplicate keys are visited)
 
 ## Version history
 

docs/mkdocs/docs/api/basic_json/operator[].md

@@ -275,8 +275,9 @@ Strong exception safety: if an exception occurs, the original value stays intact
 - documentation on [runtime assertions](../../features/assertions.md)
 - see [`at`](at.md) for access by reference with range checking
 - see [`value`](value.md) for access with default value
-- [basic_json_view::operator[]](../basic_json_view/operator%5B%5D.md) - the same access on a zero-copy view (always
-  returns a discarded view instead of assuming undefined behavior)
+- [basic_json_view::operator[]](../basic_json_view/operator%5B%5D.md) - the same access on a zero-copy view (a duplicate
+  key resolves to the first member, whereas `parse()` keeps the last; a missing key gives a discarded view instead of
+  undefined behavior)
 
 ## Version history