RFR: JDK-8309471: Limit key characters in static index pages

[Kevin Rushforth]

On Mon, 19 Jun 2023 11:18:54 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

> Backport of openjdk/jdk#14312 to limit first character keys in the static JavaDoc index pages to valid Java identifier start characters.

@hns Since this is a backport, you should change the title of this PR to: `Backport COMMITHASH` where `COMMITHASH` is the 40 character hash of the mainline jdk commit, `21f6d83358458c2e5a6cc1bc19a6a33b3262f990` in this case.

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PR Comment: https://git.openjdk.org/jdk21/pull/30#issuecomment-1597184030