RFR 8252537: Replace @exception with @throws for core-libs

[Vipin Sharma]

Hi,

Please review and sponsor the fix for replacing @exception with @throws for
core-libs.

Issue: https://bugs.openjdk.java.net/browse/JDK-8252537
Webrev: https://cr.openjdk.java.net/~vsharma/8252537

As suggested in the previous discussion
<https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-September/068486.html>,
this webrev has a consolidated fix for all subtasks of the JDK-8252536
<https://bugs.openjdk.java.net/browse/JDK-8252536>.
There is no change in the indentation as part of this webrev.

Regards,
Vipin