Close the Redis pool in the documentation examples

[MaciejZet]

Summary

The Simple Usage example creates a Redis pool and returns. On redis 5.0 through 5.2, AbstractConnection.__del__ then calls _writer.close() after asyncio.run has closed the loop. The process prints RuntimeError: Event loop is closed and exits non-zero.

await redis.close() in a finally block disconnects those writers first. close() is the method Worker already uses, and it exists across redis>=4.2,<6. On redis 5 it forwards to aclose(). aclose() itself arrived in redis 5.0.1, so the examples stay runnable on redis 4.x.

The other documentation examples that call create_pool from asyncio.run close the pool the same way.

Fixes #480

Test plan

• redis 5.1.1 against a local Redis: leaving the pool open reproduces the traceback in the issue. docs/examples/main_demo.py, slow_job.py, and retry.py finish with no Event loop is closed.
• pytest tests/test_pool_shutdown.py (uses the existing testcontainers Redis fixture)

[codecov-commenter]

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@@            Coverage Diff             @@
##             main     #533      +/-   ##
==========================================
- Coverage   96.27%   95.85%   -0.43%     
==========================================
  Files          11       11              
  Lines        1074     1085      +11     
  Branches      209      144      -65     
==========================================
+ Hits         1034     1040       +6     
- Misses         19       24       +5     
  Partials       21       21              

see 1 file with indirect coverage changes

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