ISSUE-18088: [Doc] improve style of shell commands

[sijie]

Original Issue: apache#18088

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• I searched in the issues and found nothing similar.

What issue do you find in Pulsar docs?

When I read the admin interface doc, I found that it's hard to distinguish between shell command and output.

For example:

What is your suggestion?

I suggest unifying the style of all shell commands:

1. separate output and command this way:

2. if it is a multi-line command, start with an indent and end with a slash, for example:

Any reference?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!