Add the new pipe usage for Command:stdin(), Command:stdout(), and Command:stderr()

[sxyazi]

Add the new pipe usage for Command:stdin(), Command:stdout(), and Command:stderr() to https://yazi-rs.github.io/docs/plugins/utils#command

The new stdin/stdout/stderr methods will accept the piped stdin, stdout, or stderr of another process. We need to show this in the documentation. Here’s a good example: sxyazi/yazi#1033

It would also be good to include usage instructions for the new take_stdin, take_stdout, and take_stderr methods for Child.

[sxyazi]

Done in #102 by @AnirudhG07, thanks a lot!

[github-actions]

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