RFR: 8253176: Signature.getParameters should specify that it can throw UnsupportedOperationException [v3]

[Valerie Peng]

> This is to update the method javadoc of java.security.Signature.getParameters() with the missing `@throws UnsupportedOperationException`. In addition, the wording on the returned parameters are updated to match those in Cipher and CipherSpi classes. 
> 
> CSR will be filed later.
> 
> Thanks,
> Valerie

Valerie Peng has updated the pull request incrementally with one additional commit since the last revision:

  Sync'ed w/ the wording in the other Cipher.getParameters() PR.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8396/files
  - new: https://git.openjdk.java.net/jdk/pull/8396/files/9be3644d..41e76e6e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8396&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8396&range=01-02

  Stats: 11 lines in 2 files changed: 0 ins; 3 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8396.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8396/head:pull/8396

PR: https://git.openjdk.java.net/jdk/pull/8396