RFR: 8290463: Fix several comment typos in sun.security.ec

[Hollow Man]

inifinity -> infinity
nonnce -> nonce
hasg -> hash

Signed-off-by: Hollow Man <hollowman at opensuse.org>

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Commit messages:
 - Fix several comment typos in sun.security.ec

Changes: https://git.openjdk.org/jdk/pull/9541/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9541&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290463
  Stats: 4 lines in 3 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/9541.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9541/head:pull/9541

PR: https://git.openjdk.org/jdk/pull/9541