RFR: 8261478: InstanceKlass::set_classpath_index does not match comments

[Calvin Cheung]

On Mon, 24 May 2021 23:00:12 GMT, Yumin Qi <minqi at openjdk.org> wrote:

>> A simple patch for updating the comment for the `InstanceKlass::set_classpath_index()` function.
>
> LGTM. This is a leftover of JDK-8240204.

Thanks @yminqi. Since this is a comment only change, I'll integrate now.

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PR: https://git.openjdk.java.net/jdk/pull/4170