Use switch expressions and multiple labels switch case statements in jdk.javadoc

[amCap1712]

Hi!
I propose to use switch expressions and multiple case label switch statements in the jdk.javadoc module with the intent to improve the readability of the code and make it more concise.
Thanks.
Regards,
Kartik

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Progress

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$ git fetch https://git.openjdk.java.net/jdk pull/2023/head:pull/2023
$ git checkout pull/2023

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[jonathan-gibbons]

In general, this sort of IDE-based cleanup is a mixed blessing. It can cause unnecessary conflicts with other ongoing work, and it can cause problems when trying to backport other fixes to earlier releases.

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