typing: accept single-key input for blpop and brpop

[mitre88]

Description of change

• update ListCommands.blpop and ListCommands.brpop type hints from List to KeysT
• this matches actual runtime behavior (single key str is accepted via list_or_args)
• also tweak docstrings to remove wording that implies only list input is valid

Closes #3986

Pull Request check-list

• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Do tests and lints pass with this change?
• Do the CI tests pass with this change?
• Is the new or changed code fully tested?
• Is there an example added to the examples folder (if applicable)?

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Note

Low Risk
Low risk documentation-only change; no runtime behavior or command execution logic is modified.

Overview
Clarifies the ListCommands.blpop and ListCommands.brpop docstrings to remove wording that implies keys must be a list, aligning the docs with the existing ability to pass a single key.

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