Apply the review's wording fixes to the json_view documentation

- Copying is disabled because of its cost, not because of two documents
  borrowing the same buffer; the unique_ptr follows from move-only.
- Inputs: streams, FILE*, and wide characters (strings, arrays, pointers)
  are all supported and owned; point to parse_copy() for owned copies.
- The error replay only runs for failing input, builds no values, and is
  skipped with allow_exceptions = false.
- read() writes copied inputs into the previous owned copy.
- Views can dangle like std::string_view, and why there is no
  shared/weak pointer design.
- The 4 GiB limit (16-byte nodes, 16-byte scanner steps), streams being
  read to the end first, which macros apply, why materialize() has no
  source positions, and wording nits (accept() vs basic_json::accept(),
  is_binary, is_discarded, see-also lists, size table, "back into").

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

docs/mkdocs/docs/api/basic_json_view/is_object.md

@@ -38,7 +38,8 @@ Constant.
 ## See also
 
 - [is_structured](is_structured.md) - return whether the type is structured
-- [size](size.md), [empty](empty.md) - the number of elements, and whether there are none
+- [size](size.md) - the number of elements
+- [empty](empty.md) - whether there are no elements
 - [`BasicJsonType::is_object`](../basic_json/is_object.md) - the corresponding function of `basic_json`
 
 ## Version history