RFR: Add notes on avoiding spurious introduction of labels.

[Iris Clark]

On Fri, 16 Oct 2020 17:38:59 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> Include discussion of using label autocomplete to ensure that an existing label is used.

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!

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Marked as reviewed by iris (Reviewer).

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