RFR: 8296820: Add implementation note to SSLContext.getInstance noting subsequent behavior if protocol is disabled

[Sean Mullan]

Please review this PR to add an implementation note to the`SSLContext.getInstance` methods to document the behavior when a protocol is disabled.

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Commit messages:
 - Update wording for SunJSSE provider.
 - Initial revision.

Changes: https://git.openjdk.org/jdk/pull/11172/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11172&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296820
  Stats: 27 lines in 1 file changed: 27 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11172.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11172/head:pull/11172

PR: https://git.openjdk.org/jdk/pull/11172