RFR: 8319670: Improve comments describing system properties for TLS server and client for max chain length

[Hai-May Chao]

Please review the comment change in SSLConfiguration class that describes TLS related system properties used to enforce certificate chain length. Thanks.

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Commit messages:
 - Improve comments describing system properties for TLS server and client for max chain length

Changes: https://git.openjdk.org/jdk/pull/16576/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16576&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319670
  Stats: 29 lines in 1 file changed: 14 ins; 5 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/16576.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16576/head:pull/16576

PR: https://git.openjdk.org/jdk/pull/16576