replace links from redis.io to valkey.io in source code

[Elen-Ghulam]

Describe the feature

Right now comments contain refences to redis.io site, those need to be replaced with the equivalent references to the valkey.io site.

here is an example

Use Case

correct documentation

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Client version used

current version

Environment details (OS name and version, etc.)

all of them

[Yury-Fridlyand]

also we need to update function/class names and comments