RFR: 8290669: Fix wording in sun.security.ec

[longxu0509]

this patch fixes several wording in sun.security.ec

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Commit messages:
 - Fix wording in sun.security.ec

Changes: https://git.openjdk.org/jdk/pull/9606/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9606&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290669
  Stats: 3 lines in 3 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9606.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9606/head:pull/9606

PR: https://git.openjdk.org/jdk/pull/9606