RFR: 4847239: (spec) File.createTempFile() should make it clear that it doesn't create the temporary directory

[Brian Burkhalter]

Augment the specification of `java.io.File.createTempFile(String,String,File)` to clarify its behavior with respect to the `File` parameter `directory`.

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Commit messages:
 - Merge
 - 4847239: (spec) File.createTempFile() should make it clear that it doesn't create the temporary directory

Changes: https://git.openjdk.java.net/jdk/pull/4561/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4561&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-4847239
  Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4561.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4561/head:pull/4561

PR: https://git.openjdk.java.net/jdk/pull/4561