RFR: 8261306: ServiceLoader documentation has malformed Unicode escape

[Brian Burkhalter]

Please review this really small correction to the class level documentation of `java.util.ServiceLoader`.

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Commit messages:
 - 8261306: ServiceLoader documentation has malformed Unicode escape

Changes: https://git.openjdk.java.net/jdk/pull/2468/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2468&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261306
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2468.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2468/head:pull/2468

PR: https://git.openjdk.java.net/jdk/pull/2468