RFR: 8273091: Doc of [Strict]Math.floorDiv(long, int) erroneously documents int in @return tag

[Raffaello Giulietti]

This PR corrects a typo in the JavaDoc of `[Strict]Math.floorDiv(long,int)`.

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Commit messages:
 - 8273091: Doc of [Strict]Math.floorDiv(long,int) erroneously documents int in @return tag

Changes: https://git.openjdk.java.net/jdk/pull/5287/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5287&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273091
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5287.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5287/head:pull/5287

PR: https://git.openjdk.java.net/jdk/pull/5287