docs/rabbitmqctl.8: Fix various syntax errors

Some common mistakes such as:
    - no newline after a final `.`;
    - mdoc commands in the middle of a paragraph;
    - `Op` used even though it shouldn't enclose remaining content on
      this line

I also changed variants (e.g. -t and --timeout) so they are separated by
comas, not pipes, because this is the conventions for them: they are the
same thing, not different options you have to pick.

Finally, a few typos were also fixed.

[#144034507]

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