RFR: JDK-8285614: Fix typo in java.lang.Float

[Joe Darcy]

Fix typo introduced in JDK-8261123.

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Commit messages:
 - JDK-8285614: Fix typo in java.lang.Float

Changes: https://git.openjdk.java.net/jdk/pull/8390/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8390&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285614
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8390.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8390/head:pull/8390

PR: https://git.openjdk.java.net/jdk/pull/8390