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

[Pavel Rappo]

> On 4 Sep 2020, at 21:32, Vipin Sharma <vipinsharma85 at gmail.com> wrote:
> 
> 
> I have generated Javadoc for all updated packages and compared html files, before and after changes.

Since effects can be nonlocal (e.g. {@inheritDoc}), you should always compare everything.

>> There are ~ 1.5K lines, 86 files changed in this patch, do we have any tool to compare Javadoc or it should be done manually ?

diff(1) does the job.

-Pavel