chore: update descriptions for commands

[hezhizhen]

Summary

1. Use imperative sentences for command descriptions
2. Use exported functions for commands added to the root

How was it tested?

[ipince]

Thanks!

[savil]

Use exported functions for commands added to the root

why is this needed?

[hezhizhen]

Use exported functions for commands added to the root

why is this needed?

Not needed, because all functions are in the same package.

But most of functions for commands added to the root are exported and sub-commands for these commands are unexported. So I think it's better to follow the pattern.

@savil What do you think?

[savil]

Oh I see. I think that may be an oversight. In general, we should bias towards not visible unless we intentionally want to export the function.

So, could we instead go the other way, and make the exported Command Functions be internal? I don't see a good reason for why they need to be exported.

[hezhizhen]

Oh I see. I think that may be an oversight. In general, we should bias towards not visible unless we intentionally want to export the function.

So, could we instead go the other way, and make the exported Command Functions be internal? I don't see a good reason for why they need to be exported.

Okay, I've changed all functions to be internal.

[savil]

@hezhizhen thank you! for your PR and openness to modifying it.