doc: format command line prompts

[B1F030]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Format command line prompts:
If the code block contains only commands, remove the command line prompt $/#;
If the code block contains commands and output logs, keep the command line prompt $;
When the code block is shell/sh/bash, use $ instead of #, because # may be performed as comment in website.

Which issue(s) this PR fixes:
related comment

Special notes for your reviewer:

[B1F030]

/cc @windsonsea @zhzhuang-zju

[zhzhuang-zju]

/lgtm thanks for your import commit!

Format command line prompts:
If the code block contains only commands, remove the command line prompt $/#;
If the code block contains commands and output logs, keep the command line prompt $;
When the code block is shell/sh/bash, use $ instead of #, because # may be performed as comment in website.

I think new documents added in the future need to follow these rules as well, and be formatted as uniformly as possible

[windsonsea]

/lgtm
Thanks.

[RainbowMango]

/approve

[karmada-bot]

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