RFR: 8268224: Cleanup references to "strictfp" in core lib comments

[Joe Darcy]

With the right baseline this time, as noticed by John Rose, after JEP 306 removing non-strict floating-point was integrated, a few stale references were left to "strictfp" and "value sets" in core library comments. This changeset removes those stray references.

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Commit messages:
 - 8268224: Cleanup references to "strictfp" in core lib comments

Changes: https://git.openjdk.java.net/jdk/pull/4349/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4349&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268224
  Stats: 56 lines in 2 files changed: 0 ins; 45 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4349.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4349/head:pull/4349

PR: https://git.openjdk.java.net/jdk/pull/4349