Document dump() of json_view

- API pages for dump, number_format, and operator<< of basic_json_view,
  linked both ways with the basic_json pages
- the feature page describes document order and number_format::source
- the examples show when the view helps: forwarding part of a message
  and writing numbers exactly as they were read

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

docs/mkdocs/docs/examples/basic_json_view__dump.output

@@ -0,0 +1,14 @@
+{"id":2,"temp":87.3}
+{
+  "name": "cache",
+  "host": "db1",
+  "port": 6379,
+  "timeout": 30
+}
+
+{
+  "host": "db1",
+  "name": "cache",
+  "port": 6379,
+  "timeout": 30
+}