RFR: 8294730: Add @throws and @implNote clauses to BigInteger::isProblablePrime and BigInteger::nextProblablePrime

[Raffaello Giulietti]

Completes the spec of [PR 10541](https://github.com/openjdk/jdk/pull/10541)

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Commit messages:
 - 8294730: Add @throws and @implNote clauses to BigInteger::isProblablePrime and BigInteger::nextProblablePrime

Changes: https://git.openjdk.org/jdk/pull/10543/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10543&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294730
  Stats: 9 lines in 1 file changed: 9 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10543.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10543/head:pull/10543

PR: https://git.openjdk.org/jdk/pull/10543