Refine developer documentation for Valkey setup and improve CLI avail… #6818

Job	Run time
get-matrices	3s
lint	1m 7s
get-containers	0s
Running Module Tests	0s
test-python-container	0s
test-pubsub-python (3.9, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-l...	8m 38s
test-python (3.9, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gn...	21m 37s
test-pubsub-python (3.9, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-li...	6m 8s
test-python (3.9, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gnu...	18m 27s
test-pubsub-python (3.13, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-...	8m 48s
test-python (3.13, valkey, 8.0, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-g...	21m 49s
test-pubsub-python (3.13, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-l...	6m 15s
test-python (3.13, redis, 6.2, always, ubuntu, linux, ubuntu-latest, x64, x86_64-unknown-linux-gn...	18m 0s
	1h 50m 52s

Provide feedback