Update CONFIG GET and CONFIG SET documentation and tests #6648

Job	Run time
get-matrices	4s
lint	1m 22s
get-containers	0s
Running Module Tests	1s
test-python-container	0s
test-python (3.9, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gn...	21m 9s
test-pubsub-python (3.9, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-l...	8m 35s
test-python (3.9, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gnu...	18m 31s
test-pubsub-python (3.9, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-li...	6m 11s
test-python (3.13, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-g...	21m 5s
test-pubsub-python (3.13, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-...	8m 46s
test-python (3.13, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gn...	17m 53s
test-pubsub-python (3.13, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-l...	6m 23s
	1h 50m 0s

Provide feedback