RFR: 8278154: SimpleFileServer#createFileServer() should specify that the returned server is not started

[Julia Boes]

This doc-only change amends the method-level documentation of SimpleFileServer#createFileServer() to specify the state of the returned server.

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Commit messages:
 - initial commit

Changes: https://git.openjdk.java.net/jdk/pull/6674/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6674&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278154
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6674.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6674/head:pull/6674

PR: https://git.openjdk.java.net/jdk/pull/6674