RFR: 6753: JMC Help Documentation requires corrections

[Marcus Hirt]

On Fri, 5 Feb 2021 19:15:18 GMT, Suchita Chaturvedi <schaturvedi at openjdk.org> wrote:

> This PR updates the old instructions of starting JMC when it was bundled as part of jdk.
> 
> Please review the change and let me know if there are any changes required.

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/212