RFR: 8264606: More comment for ECDH public key validation [v2]

[Xue-Lei Andrew Fan]

> Improve the readability by adding more comments in the ECDH public key validation implementation in JDK.

Xue-Lei Andrew Fan has updated the pull request incrementally with one additional commit since the last revision:

  typo correct of unmapable character in the comment line

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3313/files
  - new: https://git.openjdk.java.net/jdk/pull/3313/files/04d7e1cc..11c2bcdf

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3313&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3313&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3313.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3313/head:pull/3313

PR: https://git.openjdk.java.net/jdk/pull/3313