RFR: Add notes on avoiding spurious introduction of labels.

[Jesper Wilhelmsson]

On Mon, 19 Oct 2020 17:05:06 GMT, Stuart Marks <smarks at openjdk.org> wrote:

>> Yes!
>> 
>> Historical Note: The use of labels has changed over time.  In very early versions of the JDK bug system, the equivalent
>> labels field was treated as an index.  Because all of that information has been retained, the set of existing labels is
>> huge!
>
> @JesperIRL Can you sponsor this change? (If you're ok with it of course.) Iris has reviewed it so I think it falls to
> you to sponsor it. Thanks.

Good addition. Thanks!

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PR: https://git.openjdk.java.net/guide/pull/31