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docs: cross-reference json_view and json_document for 3.13.0 (#5892)

* docs: cross-reference json_view and json_document for 3.13.0

Document the new zero-copy document/view API across the docs: add a
"Documents and views" section to the basic_json API hub linking to all
specializations, point parsing/conversion/modifying pages to the view-based
alternatives, add document/view sections to feature pages, update the
landing page to mention json_view.hpp/json_literals.hpp, and cross-link
debugging/exceptions.

Also document wide-string inputs (and ill-formed UTF-16/32 rejection),
add parse/accept examples for wide strings, fix related doc gaps, and
align features/parsing and FAQ with the added support.

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

* docs: fix article before std::istream in FAQ

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

* docs: clarify document inputs, decoding, get<T>() and editing

Address review comments: say which inputs are borrowed and that a wide
string pointer is an extra input, which values are decoded during parsing,
that get<T>() reads only built-in types directly, all forms of set() and
that the document's insert() is array-only, and how to store wide strings.

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

* docs: integers are converted while parsing a document

Also say "They accept every input" in basic_json_document::parse.

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

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

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