[doc] Adjust yuanrong backend doc (#104)

## Description
I've updated the description in the Yuanrong backend documentation,
adding more usage guidance.

## Main changes
- Add more detailed descriptions regarding installation and usage.
- Adjust demos and use `transfer_queue.init()` to start
`TransferQueue&Yuanrong`.
- Add instructions for manually launching Yuanrong when
`auto_init=False`.
- Add _FAQ_ to record common issues during the use of Yuanrong.

---------

Signed-off-by: dpj135 <958208521@qq.com>

Author: dpj135

README.md

@@ -77,7 +77,7 @@ This class encapsulates the core interaction logic within the TransferQueue syst
 Currently, we support the following storage backends:
 
 - SimpleStorage: A basic CPU memory storage with minimal data format constraints and ease of use.
-- [Yuanrong](https://gitee.com/openeuler/yuanrong-datasystem) (beta, [#PR107](https://github.com/TransferQueue/TransferQueue/pull/107), [#PR96](https://github.com/TransferQueue/TransferQueue/pull/96)): An Ascend native data system that provides hierarchical storage interfaces including HBM/DRAM/SSD.
+- [Yuanrong](https://gitee.com/openeuler/yuanrong-datasystem) ([usage guide](docs/storage_backends/openyuanrong_datasystem.md), beta, [#PR107](https://github.com/TransferQueue/TransferQueue/pull/107), [#PR96](https://github.com/TransferQueue/TransferQueue/pull/96)): An Ascend native data system that provides hierarchical storage interfaces including HBM/DRAM/SSD.
 - [MooncakeStore](https://github.com/kvcache-ai/Mooncake) (beta, [#PR162](https://github.com/TransferQueue/TransferQueue/pull/162)): A high-performance, KV-based hierarchical storage that supports RDMA transport between GPU and DRAM.
 - [RayRDT](https://docs.ray.io/en/master/ray-core/direct-transport.html) (alpha, [#PR167](https://github.com/TransferQueue/TransferQueue/pull/167)): Ray's new feature that allows Ray to store and pass objects directly between Ray actors.