cli/command/completion: change signatures to return a cobra.CompletionFunc #6448
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It's adding a slight indirection by constructing a function when called,
but makes the completion functions more consistent, the signature easier
to read, and making the return type a cobra.CompletionFunc makes it
more transparent what it's intended for, and helps discovery of functions
that provide completion.
Before this patch:
With this patch:
- Human readable description for the release notes
- A picture of a cute animal (not mandatory but encouraged)