Example usage has been either merged with examples or usage keys. This heading was not required separately.
This PR edits & rearranges Examples, Example Notifications and Example Usage data.
Changelog-None.
- Added missing Example Notifications Heading
- Renamed `example_json_notifications` to `example_notifications`
- Moved `example_notifications` to the end of the page
- Changed ALL `doc/schemas/lightning-*.json` file's `json_example` to `examples`
- Change the heading from example to examples
- Bring shell command before the json command
- Move Example to the end of the page
- Remove horizontal line from Example
Merge information from `*.request.json` & `*.schema.json`. Also consolidate remaining details from `*.md` files and create a single file in schemas folder.
